Where Horn Antennas Fit in a WISP Network

A wireless ISP delivers broadband in hops, as the diagram shows. A dish antenna receives the feed from an upstream base station. A repeater radio passes it to the access antenna on the tower, which sends service out to each house. The backhaul hop is a point-to-point link, usually built on dish antennas. At the house, each subscriber connects through a CPE antenna.

The access antenna is the point-to-multipoint side of the network, and it decides how many subscribers a tower can carry. The diagram shows a sector panel in that position. This guide covers the narrow-beam horn antennas that take its place as the network grows, on towers and rooftops alike. The "WISP mode" setting on consumer routers is a separate topic. To cover a park, campus or venue with WiFi, see our outdoor WiFi coverage guide.

Why WISPs Move from Sector Panels to Horn Antennas

As Wireless Internet Service Providers grow, they hit a "density wall." Adding subscribers to one tower with traditional 90° or 120° sector panels leads to self-interference and spectrum exhaustion. Each wide sector hears radios across a broad arc, so neighboring sectors struggle to reuse the same channels.

The answer is network densification with narrow-angle horn antennas. A horn confines its energy to a tight beam, so one tower can carry more sectors and reuse frequencies more often. If you are still sizing a conventional sector layout, our guide to outdoor sector antennas covers that side.

The Advantage of Symmetrical RF Energy

Horns beat patch-array sector panels at a busy site because of the shape of their beam. A sector panel throws a flat beam that is wide horizontally and narrow vertically. A round dual-polarized horn antenna produces a near-symmetrical beam instead. The BBT-4971HO20R-N2, for example, is specified at 20° horizontal by 17° vertical across 4.9–5.4 GHz.

That even beam, with its low side lobes, collects less noise from the ground and sky and lowers the noise floor on 5.8 GHz horn antenna links. Every BBT horn in this guide also specifies a front-to-back ratio of at least 25 dB and port-to-port isolation of at least 25 dB. Signals from behind the antenna stay out of the receiver, and the H and V chains of a 2×2 MIMO radio stay cleanly separated.

When to Choose 20° vs 30° Horn Antennas for Your Tower

For most high-performance point-to-multipoint antenna deployments, the choice comes down to 20° versus 30° horns. As a China antenna manufacturer that builds both, BBT ANTENNAS breaks down the technical differences so you can plan each tower with confidence.

Scenario A: When to Use the 20° WISP Horn

The 20° horn antenna is the "sniper rifle" of WISP connectivity. It provides the highest gain and the tightest RF containment, reaching 20.5 dBi on the BBT-4971HO20R-N2 in the upper band.

• Long-distance clusters: the narrower beam focuses energy more intensely, so it reaches client clusters far from the tower. These are your long-range shots.
• Maximum frequency reuse: on a crowded tower, 20° WISP horns allow extreme collocation. You can stack multiple horns side by side with minimal separation.
• High-noise environments: in urban areas where the spectrum is polluted, the 20° beamwidth acts as a spatial filter and rejects noise from outside its narrow field of view.

Scenario B: When to Use the 30° WISP Horn

The 30° horn antenna is the versatile workhorse for WISP antenna deployments. It strikes a balance between coverage area and isolation.

• Micro-PoP deployments: for smaller towers or rooftops serving a local neighborhood, a set of 30° horns delivers excellent coverage without the overhead of managing too many sectors.
• Wider client spread: when subscribers are scattered but you still need better performance than a standard sector, the 30° horn captures a wider area while avoiding the side-lobe problems of patch antennas.
• Cost efficiency: covering 360° takes 12 horns at 30° against 18 at 20°, which cuts the initial hardware investment in base station antennas.

How the options compare on one tower:

Unit counts assume each antenna covers its nominal beamwidth. Real layouts depend on where subscribers sit and how much overlap you leave between sectors. Sector figures come from BBT 5 GHz sector panels, which reach similar gain by squeezing the vertical beam. The horn's advantage lies in how tightly it confines energy across the horizon.

BBT WISP Horn Antennas for 20° and 30° Sectors

The 20° scenario maps to the round BBT-4971HO20R-N2, the 30° scenario to the asymmetrical BBT-4971HO18HV-N2, and the compact BBT-4971HO15HV gives a lighter 30° option on the 4.9–5.4 GHz band. Card values run in band order: 4900–5400, 5400–6400 and 6400–7125 MHz.

20° Horn for Long-Range, Dense Towers

BBT-4971HO20R-N2

4900–7125 MHz
19 / 20 / 20.5 dBi
Horizontal 20° / 17° / 15°
Vertical 17° / 15° / 15°
H/V dual-pol · 2 × N-Female
Φ230 × 350 mm · 0.75 kg

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30°-Class Asymmetrical Horn for Micro-PoPs

BBT-4971HO18HV-N2

4900–7125 MHz
16.5 / 17.5 / 17.1 dBi
Horizontal 40° / 36° / 30°
Vertical 20° / 19° / 18°
6 dB horizontal 65° / 60° / 55°
H/V dual-pol · 2 × N-Female
226 × 92 × 350 mm · 0.7 kg

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Compact Horn, 30° on the Low Band

BBT-4971HO15HV

4900–7125 MHz
15.5 / 17 / 18 dBi
Horizontal 30° / 24° / 20°
Vertical 24° / 22° / 19°
H/V dual-pol · 2 × N-Female
Φ150 × 240 mm · 0.45 kg

View Detail

Need a beam between the two? The BBT-4971HO19HV delivers 17.5 / 19 / 19 dBi with a 23° / 23° / 20° horizontal beam. All four models belong to BBT's Horn 4900–7125 MHz range.

Gain and Beamwidth by Band

A horn's beam narrows as frequency rises, so a "20°" or "30°" label only holds on part of the band. Pick the model by the band your radios actually run.

Model	Band (MHz)	Gain	Horizontal beamwidth (3 dB)	Vertical beamwidth (3 dB)
BBT-4971HO20R-N2 Round horn	4900–5400	19 dBi	20°	17°
	5400–6400	20 dBi	17°	15°
	6400–7125	20.5 dBi	15°	15°
BBT-4971HO19HV Round horn	4900–5400	17.5 dBi	23°	20°
	5400–6400	19 dBi	23°	18°
	6400–7125	19 dBi	20°	17°
BBT-4971HO15HV Compact round horn	4900–5400	15.5 dBi	30°	24°
	5400–6400	17 dBi	24°	22°
	6400–7125	18 dBi	20°	19°
BBT-4971HO18HV-N2 Rectangular, asymmetrical horn	4900–5400	16.5 dBi	40°	20°
	5400–6400	17.5 dBi	36°	19°
	6400–7125	17.1 dBi	30°	18°

Nominal values from BBT product specifications, with tolerances of ±0.5 dBi for gain and ±3° to ±5° for beamwidth. All four models share H/V dual polarization, 2 × N-female connectors, VSWR ≤2.0, a front-to-back ratio of ≥25 dB, port-to-port isolation of ≥25 dB, 50 Ω impedance, 100 W max input, DC grounding, an aluminium alloy body with a white radome, -40 °C to +60 °C operation, Φ30–60 mm pole mounting and a 60 m/s rated wind velocity.

Browse All Horn Antennas

Symmetrical or Asymmetrical Horn Antennas?

Horns come in two beam shapes, and BBT ANTENNAS builds both. Our horn vs dish comparison explains how a horn forms its beam. On a tower, that shape decides how each sector behaves.

• Symmetrical (round) horns keep the horizontal and vertical beams close. The BBT-4971HO20R-N2 runs 20° / 17° / 15° horizontally and 17° / 15° / 15° vertically across its three bands. That clean, focused beam suits long-range, high-density sectors where every degree of isolation counts.
• Asymmetrical (rectangular) horns open up the horizontal beam and keep the vertical beam tight. The BBT-4971HO18HV-N2 runs 40° / 36° / 30° horizontally against 20° / 19° / 18° vertically, so it covers a wider arc with fewer units while still holding down noise from the ground and sky.

Use round horns where distance and frequency reuse matter most, and rectangular horns where one mount has to cover a broad neighborhood. Many towers mix both, with a 20° horn aimed at a distant cluster beside 30°-class horns serving nearby streets.

One Antenna, All Frequencies: 4.9 to 7.1 GHz

Future-proofing is critical. Hardware that only supports legacy 5 GHz bands is a risk as networks move to WiFi 6E and WiFi 7.

BBT ANTENNAS builds its 4900–7125 MHz horn antennas as true ultra-wideband designs. The same physical antenna supports:

• Public safety (4.9 GHz)
• Unlicensed 5 GHz (UNII-1, 2, 3)
• New 6 GHz spectrum (5925–7125 MHz)

WISPs can upgrade their radios to newer 5 GHz standards or 6 GHz proprietary protocols without paying for a tower climb to change the antenna. The horn you install for 5 GHz today is ready for 6 GHz radios tomorrow. The radio sets which channels run within local spectrum rules. Expect the beam to tighten toward the top of the band, as the table above shows.

Why WISPs Source Horn Antennas from BBT ANTENNAS

From the surgical precision of a 20° beam to the balanced coverage of a 30° beam, the shift to horn technology is inevitable for WISP networks that keep growing. BBT ANTENNAS designs and manufactures these horns in Foshan, China, for wireless ISPs, network integrators and wireless equipment makers.

• A complete WISP horn line: four dual-polarized models covering 4900–7125 MHz at 15.5 to 20.5 dBi, in round and rectangular formats. BBT's official catalog lists its horn antennas in the WLAN and WiFi range for point-to-point and point-to-multipoint systems.
• Built for exposed towers: DC-grounded lightning protection, a 60 m/s rated wind velocity and -40 °C to +60 °C operation on every model.
• Tested in-house: network analyzers for RF verification, plus rain and salt-spray test equipment.
• More than 30 years in antennas: BBT's history begins in 1991.
• Scale and engineering depth: more than 200 staff, including RF, microwave, simulation and structural engineers, and a 30,000 m² workshop for R&D and production.
• Certified quality systems: ISO 9001:2015 and ISO 14001:2015.
• Four-stage quality control: raw material, in-process, final and pre-shipment inspection.
• Customization and OEM/ODM: custom frequency band, gain, beamwidth, polarization, connectors and housing color.

Need a custom band, beamwidth or connector? We provide custom and OEM/ODM horn antennas. Pricing is quoted per project, and samples are available for evaluation. See our Custom & OEM antenna manufacturing page.

WISP Horn Antenna FAQ