VHF Communications Antenna

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The 21-20-70 is a lightweight, single hole fixing VHF “whip” antenna suitable for helicopters or aircraft operation up to 350 knots.

The antenna radiating element is encapsulated within a strong glass-epoxy tube which in turn is integrated into an aluminum alloy base containing a TNC connector and loss-less matching cavity. Installation requires insertion into a 17.5mm (11/16in) hole in the airframe and securing with the washes and nuts provided.

Very light weight
VHF/FM and maritime band operation
Single hole fixing
Suitable for up to 350 knots
TNC female connector

	21-20-70
Model #	21-20-70
Brand	Cooper Antennas

Frequency	166-172 MHz
Gain (typical)	≥ +3.5 dBi at beam max
VSWR	≤ 1.5:1 across band ≤ 1.2:1 @ 169.5 MHz
Impedance (nominal)	50 Ohms nominal
Power	50 Watts CW
Polarization	Linear (vertical when vertically mounted)
Radiation	Omni-directional in azimuth within 0.25 dB when vertically mounted
Antenna RF Connector	TNC Female