WISP and Fixed Wireless Access Antenna Solutions for Point-to-Multipoint
A WISP business is decided at the edge of the cell. Every subscriber beyond the design radius costs signal-to-noise margin, and every tower sector that cannot reuse a channel costs capacity. Antenna choice sets both limits before a single radio is configured. RF element builds 5 GHz sectors, parabolic dishes and dual-band grids for tower distribution and subscriber premises.
Where the link budget is actually lost
Sector choice fixes capacity reuse
A 90-degree sector with 19 dBi concentrates energy into the sector it serves, which allows tighter angular reuse between adjacent sectors on the same tower. A wider sector covers more subscribers per radio but leaks energy into neighbouring sectors and reduces the achievable reuse pattern.
The subscriber end is the weak link
Most failed installs fail at the CPE, not at the tower. A small dish misaligned by two degrees, or a grid antenna partially blocked by a roof edge, produces a link that works in winter and drops in leaf. Alignment discipline and a mount that does not move are worth more than tower-side gain.
Interference arrives from the same band
5 GHz is shared with Wi-Fi access points, and in dense areas the noise floor rises through the season. Narrower beamwidth and cross-polarization discrimination reduce the interference a sector receives, which is often more valuable than a higher gain figure.
Antenna selection by deployment case
The table maps the four standard roles in a WISP network. Gain and beamwidth are a trade: the dish reaches furthest but needs a solid mount and a clear path, the sector serves many subscribers but gives less per-link margin, and the grid is the usual compromise at the subscriber end.
| Antenna type | Frequency range | Gain | Typical use |
|---|---|---|---|
| MIMO sector | 5150-5850 MHz | 19 dBi | Tower distribution, 90-degree sectors |
| Parabolic dish | 4900-6000 MHz | 31-33 dBi | Long backhaul and difficult subscribers |
| Dual-band grid | 2.4-2.5 / 5.15-5.85 GHz | 21-22 dBi | Subscriber premises with 2.4G fallback |
| Bridge panel | 5150-5850 MHz | 18 dBi | Short point-to-point hops |
Band, gain and polarization trade-offs
Every 3 dB of gain doubles the link margin in one direction, but only while the beam still covers the subscriber. A 33 dBi dish with a 4-degree beam needs a mount that holds alignment within about a degree; an 18 dBi panel is far more forgiving at the cost of roughly half the reach.
Cross-polarization discrimination matters more than gain in a congested area. Two sectors on the same tower with good XPD can reuse a channel; two with poor XPD cannot, whatever their gain figures say. That is why we publish polarization alongside gain.
Recommended antennas
These four models cover tower, backhaul and subscriber roles. Every value below is copied from the specification table, including the dual-band grid gains at each band.
5GHz MIMO Sector Antenna
5GHz MIMO Parabolic Dish Antenna
Dual Band WiFi Parabolic Grid Antenna
5GHz Wireless Bridge Panel Antenna
Frequency, gain, beamwidth and connector values are taken from the linked product specification tables. Confirm the final configuration against the datasheet before ordering.
Installation and deployment notes
WISP deployments live or die on installation discipline. The points below are the ones most often skipped under schedule pressure.
- Align subscriber antennas with a live signal reading, not with a visual sighting; two degrees is enough to lose a long path.
- Use a mount that resists wind loading at the actual height, and re-check alignment after the first storm season.
- Keep the subscriber antenna clear of roof edges, chimneys and metal flashing within the first Fresnel zone.
- Use shielded cable and keep the run short; on long drops the cable loss can exceed the antenna gain saved.
- Record RSSI, SNR and modulation at installation so that later degradation can be measured rather than guessed.
Frequently asked questions
Sector or dish for a tower?
A sector serves many subscribers across an angular range and is the normal choice for distribution. A dish serves one link with high margin and is used for backhaul or for a subscriber at the edge of the service area. Most towers use sectors and reserve dishes for the backhaul hop.
Is a dual-band grid worth it?
It is useful where the subscriber has both 2.4 GHz and 5 GHz radios, or where 5 GHz is congested. The grid gives 21 dBi at 2.4 GHz and 22 dBi at 5 GHz in the same housing, so one install covers both. If the site is 5 GHz only, a single-band dish or panel is simpler.
What beamwidth should a sector have?
Ninety degrees is the common starting point for a three-sector tower. Narrower sectors increase gain and reduce interference but require more radios; wider sectors reduce radio count but limit reuse. The right answer comes from the subscriber distribution around the tower.
Do you supply subscriber antennas in volume?
Yes. We supply both tower and CPE antennas, and we can brand and package them for a WISP that stocks its own installation kits.
Related technical reading
Related industries
Fixed wireless is a link budget problem with a mast attached. These sectors run the same budget.
What to send for an antenna shortlist
Send these five items and we can propose models with pattern data instead of a catalogue list.
- Tower coordinates, height and sector plan
- Subscriber distribution and maximum radius
- Band, channel width and transmit power
- CPE mounting type and available mast length
- Quantities for tower and subscriber units
Send your layout, get an antenna shortlist
Send the tower coordinates, the subscriber distribution and the band plan, and we will propose sector and CPE antennas for a link budget.
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