VHF/FM Airborne Antenna

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VHF/FM Airborne Antenna

The 21-20-38/03 is an externally mounted airborne VHF/FM antenna operating over the VHF/FM and Sonobuoy bands of 135-175 MHz.

A fiberglass rod with an internal bent stainless steel element is fitted into an aluminum base which contains foamed-in place matching circuits capable of handling up to 50 Watts power.

The method of construction provides protection from world-wide military environmental conditions including high vibration, shock and temperature variations.

Covers high VHF/FM and Sonobuoy Bands
Lightweight and Low Profile
Only 9.5” stand off height
For helicopter and fixed wing aircraft up to 250 Knots
Glass/Epoxy –Aluminum construction
Small footprint
Designed to MIL-STD-810 Environmental Conditions

	21-20-3803
Model #	21-20-38/03
Brand	Cooper Antennas

Frequency	135 - 175 MHz
Gain (typical)	0 dBi
VSWR	≤ 2.75:1
Impedance (nominal)	50 Ohms
Power	50 Watts
Polarization	Linear (vertical when vertically mounted)
Radiation	Nominally omni directional in azimuth plane
Antenna RF Connector	TNC Female

Construction	Fibreglass encased stainless steel whip Aluminum base
Height	9.5 inches (241 mm)
Weight	0.6 lbs (0.27 kg)
Base Plate Shape	Tear drop
Fixing Holes	4 x Ø 0.170 inches (4.3mm) ±0.005 inches (0.127mm) holes, counter sunk at 100° Ø 0.280 inches (7.1mm).