VHF Airborne Blade Antenna

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The 21-20-18 is a high performance VHF airborne blade antenna suitable for aircraft operating in excess of Mach 2.

Construction is from a one piece fiberglass blade moulding intimately bonded into an aluminum alloy base block which houses the matching circuits and provides for very solid attachment to the airframe via 6 fixing holes drilled to the same pattern as the AT-256 UHF antenna.

The metal base block also enables the 21-20-18 to meet the lightning protection requirements of AS-3191/A.

Internal radiating element are shaped in such a way as to produce minimum VSWR and also to optimize radiation. The antenna assembly is sealed by closed cell foam and finished in lusterless black or grey urethane paint.

	21-20-18
Model #	21-20-18
Brand	Cooper Antennas

Frequency	161.50 MHz to 162.50 MHz
Gain (typical)	+4 dBi when mounted at center of an 8 foot (2.4m) minimum diameter ground plane.
VSWR	≤ 2.5:1
Impedance (nominal)	50 Ohms
Power	100 Watts CW
Polarization	Vertical (when mounted vertically)
Radiation	Omni directional in azimuth plane
Antenna RF Connector	N Female

Antenna Shell Type	Epoxy/fiberglass blade in aluminum alloy base collar
Height	9 inches (229mm)
Weight	0.9 lbs (0.4kg)
Side Loading	≥ 8 psi ultimate
Base Plate Shape	Diamond shape
Fixing Holes	6 x Ø 0.203 inch (5.2mm) holes, counter bored Ø 0.43 inches (10.9mm)