BNC Monopole
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Experimental Aircraft Only
The UC331 is a non-certified transponder antenna for experimental aircraft only, which includes most UAS.
Plug and Play
Simply plug into UCF SMA connector using an SMA-to-BNC antenna cable (e.g. UC322) and it's ready to go.
Proven Performance
Antenna and cable combination already used on many UAVs and proven functional at long range.
Easy Mounting
Gasket, hex nut, and lock washer are provided. Simply provide the half-inch hole and it is ready to mount.
The UC331 is a non-certified transponder antenna for experimental aircraft, specifically targeting small unmanned aircraft (sUAS).
Target Aircraft | Unmanned Aerial Vehicles (UAV) Experimental Aircraft Microlight Gliders Parachuters Quadcopters |
Target Applications | Transponder
1090ES ADS-B DME |
Frequency | 1030 to 1090 MHz |
VSWR (1090MHz) | 1.2:1 maximum |
VSWR (1030MHz) | 2.0:1 maximum |
Radiation Pattern | Equivalent to quarter-wave stub |
Impedance | 50 Ohms |
Polarization | Linear (Vertical) |
Gain | 4.1 dBi |
RF Power Handling | 1,000 W pk @ FL550 (55,000 ft.)
20 W constant (CW) |
Connector | BNC Female |
Mounting Type | Bulkhead |
Mounting Hole | 0.505 inches (12.8 mm) |
Max. Panel Thickness | 0.219 inches (5.6 mm) |
Length (w/o connector) | 2.41 inches (61.2 mm) typ |
Length (w/connector) | 3.09 inches (78.5 mm) typ |
Weight | 0.75 oz (21.3 g) typ
0.80 oz (22.7 g) max |
Operating Temperature | -40°C to +85°C |
Max Airspeed | 300 KNOTS TAS |
Altitude | FL300 (30,000 ft.) |
Material | Nickel Plated |
- UC331 Antenna, BNC Monopole
- Hex nut, lock washer, and gasket.
- Test data with VSWR & weight measurements
- Certificate of Conformance (CoC)

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