VHF Airborne Blade Antenna

Calculate Shipping

Freight to be quoted - $0.00
As the size and weight is not normally known we use several freight carriers to ensure you get the best price. Complete your order or quote and we will get back to you with the available freight options.

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)