UniFi Swiss Army Knife Omni Antenna

Omnidirectional dual-band antenna accessory built specifically for the UniFi Swiss Army Knife Ultra. Delivers a clean 360° radiation pattern across 2.4 GHz and 5 GHz, with an IPX6-rated weatherproof body rated for fully exposed outdoor installs.

Key features

• High-efficiency omnidirectional radiation pattern for even 360° horizontal coverage.
• Dual-band tuned — 4 dBi at 5 GHz, 3 dBi at 2.4 GHz.
• IPX6 weatherproof rating, suitable for outdoor exposed mounting.
• Direct RP-SMA fit to the Swiss Army Knife Ultra's external antenna connectors.
• Slim 154 mm profile that keeps the AP's compact footprint intact.
• Zero configuration — no controller changes, no firmware, no power required.

Extend your Swiss Army Knife Ultra coverage in every direction

The UniFi Swiss Army Knife Ultra (UK-Ultra) ships with a capable internal antenna, but its two RP-SMA connectors exist for a reason: some sites need coverage shaped differently than a compact indoor AP can provide on its own. The UACC-UK-Ultra-Omni-Antenna-AO is Ubiquiti's own omnidirectional answer.

Screw the pair onto your UK-Ultra and the AP radiates evenly through 360° of horizontal plane. That's the pattern you want when the access point sits in the middle of the area it serves — a pole in a car park, a mast between two sheds, a courtyard, a marina berth, a caravan park, or an open-plan warehouse aisle. Instead of a coverage lobe that favours one face of the enclosure, you get a doughnut-shaped pattern that treats every bearing the same.

Because the antennas are tuned across both bands, you keep the full dual-band behaviour of the AP. Clients on 2.4 GHz get the reach they need for distance and penetration; 5 GHz clients get the throughput. There's no band trade-off and no separate SKU to buy per radio.

Built for outdoor exposure

The antenna body carries an IPX6 weatherproofing rating, matching the UK-Ultra itself. That means it's engineered to shrug off powerful water jets from any direction — rain, wind-driven spray, and the general abuse of a rooftop or fence-line install.

Construction is a multi-polymer build (thermoplastic polyester elastomer, polycarbonate, polybutylene terephthalate and polyoxymethylene) chosen for flexibility at the joint and UV-resilient rigidity through the radome. At 154 × 15 × 15 mm and just 42 g for the pair, they add almost nothing to wind load or mounting stress on the host AP.

Omnidirectional or directional — which do you need?

Ubiquiti offers the Swiss Army Knife antenna accessory in two patterns. Choosing correctly matters more than chasing a gain figure.

Choose the Omni Antenna (this product) when:

• The AP is centrally located and clients are all around it.
• You're covering an open area — yard, forecourt, deck, paddock, storage compound.
• Clients move around the AP and you want consistent signal on every bearing.
• You're running a multi-AP mesh and need each node to talk in several directions.

Choose the Directional Antenna instead when:

• You're pushing signal down a single corridor or across a specific span.
• You need to link the AP to a distant building, shed, camera cluster or outbuilding.
• You want to suppress coverage behind the AP for interference or security reasons.

Many installers keep both on the van. At this price point, having a pair of each is cheap insurance against a site that doesn't match the survey.

Installation takes under a minute

There's no configuration step. The antennas are passive — no power, no cabling, no firmware, and nothing to adopt in UniFi Network.

1. Power down or unmount the UK-Ultra for easier access.
2. Remove the protective caps from the two RP-SMA connectors on the AP.
3. Thread each antenna on and hand-tighten the knurled collar. Don't use tools.
4. Orient both antennas vertically. Vertical alignment is what produces the horizontal 360° pattern — angled or horizontal antennas will skew your coverage.
5. Remount and repower.

For pole and mast installs, keep the antennas clear of the pole body itself where possible. Metalwork immediately alongside a vertical omni will distort the pattern on that bearing.

Compatibility

Designed and sold specifically as an accessory for the UniFi Swiss Army Knife Ultra (UK-Ultra / UK-Ultra-US), which provides two RP-SMA connectors for external antennas.

The RP-SMA interface is a common standard, so the antennas will physically mate with other RP-SMA equipment. Performance outside the UK-Ultra is unvalidated by Ubiquiti, and regulatory certification for a given AP is granted against a specific antenna configuration — check your local rules before mixing vendors.