VHF Airborne Blade Antenna

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The 21-20-09 is a high performance VHF airborne blade antenna suitable for aircraft operating in excess of Mach 1.

Construction is from a one piece glass loaded resin plastic blade molding 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 AS-3191/A antenna.

The metal base block also enables the 21-20-09 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 epoxy paint.

Covers 150 to 180 MHz
High strength composite blade with aluminum alloy base block
Single ‘TNC’ Connector
Meets Lightning Strike Criteria of AS-3191
Environmental Performance to MIL-STD-810

	21-20-09
Model #	21-20-09
Brand	Cooper Antennas

Frequency	150 MHz to 180 MHz
Gain (typical)	0 dBi minimum when mounted at center of an 8 foot (2.4m) minimum diameter ground plane.
VSWR	≤ 2.5:1
Impedance (nominal)	50 Ohms
Power	50 Ohms
Polarization	Vertical
Radiation	Omni directional in azimuth plane
Antenna RF Connector	N Female

Antenna Shell Type	Glass loaded resin plastic blade in aluminum alloy base collar
Height	6.5 inches (165mm)
Weight	3.5 lbs (1.6kg)
Side Loading	≥ 8 psi ultimate
Base Plate Shape	Tear drop
Fixing Holes	6 x Ø 0.234 inch (5.9mm) holes, counter bored Ø 0.39 inches (9.9mm)