VHF Airborne Blade Antenna

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The 21-20-25 is a vertically polarized, omni-directional antenna, compatible with all popular airborne radios operating within the 116 to 176 MHz frequency range. These antenna can handle 200 Watts of power and requires no external tuning.

This VHF antenna developed by Cooper Antennas Ltd is particularly suited to civil and military VHF communications. Rugged design ensures reliability in world wide conditions of service on aircraft operating at speeds up to Mach 1.0. Use of a surface deposited radiating element optimizes efficiency. The element is DC grounded for lightning protection.

High Strength Broadband Blade Antenna
High Power Handling Capability
Low Loss Matching Network
Fully Foamed to Provide High Environmental Integrity
Aluminum Alloy Retaining Collar Accepts High Side Loading
Drop-on Replacement for AT-1108
Complies with MIL-STD-810
Meets Lightning Strike Requirements of MIL-DTL-85670
DC Grounded for P-Static Protection

	21-20-25
Model #	21-20-25
Brand	Cooper Antennas

Frequency	116 - 176 MHz
Gain (typical)	+1 dBi average
VSWR	≤ 2.5:1
Impedance (nominal)	50 Ohms
Power	200 Watts CW
Polarization	Vertical
Radiation	Azimuth : Omni-directional Elevation : As stub
Antenna RF Connector	N Female

Antenna Shell Type	High density foam filled epoxy/fibre glass shell set in aluminium alloy base collar
Height	14.75 inches (375mm)
Weight	4 lbs (1.8kg)
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)