The 21-20-24 VHF communication antenna features single-hole mounting and a whip style design for use on helicopters and aircraft operating up to 350 knots. The radiating element is encapsulated within a strong glass epoxy tube that is integrated with an aluminum alloy base with a TNC connector. Installation requires a 17.5 mm hole in the airframe and securing with the provided angled washers and nuts.
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规格：
Antenna Type:
VHF communications Antenna
Frequency Response:
118 MHz — 152 MHz
Mounting Pattern:
1 hole
Overall Height:
559 mm (22 in)
Weight:
0.14 kg (0.316 lb)
Gain:
≤ +2.5 dBi (typical)
VSWR:
≥ 2.51
Power:
50 watts CW
Polarization:
vertical (when vertically mounted)
Radiation Pattern:
omni-directional in azimuth within 0.25 dB when vertically mounted
Connector:
TNC (female), optional BNC as 21-20-24-1)
特征：
Extremely lightweight:
Full VHF & ATC band operation
Single-hole mounting
Maybe mounted vertically or inclined at 30°
Capable up to 350 knots
TNC connector (BNC option available)
