VOR/Localiser Balanced Loop Antenna

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The 21-20-14 is an airborne “split half” balanced loop VOR/Localiser antenna intended for helicopter and light aircraft operating up to 350 knots EAS. Installation requires one half loop being fitted on each side of a helicopter tail cone or aircraft vertical stabilizer, connected via the phase-matched harness supplied. Construction uses high integrity aluminum alloy and high strength glass-epoxy tubes with internal low loss matching. Each complete half loop is filled with high density foam to exclude moisture and enhance environmental performance.

Horizontal Polarization.
Balanced Loop minimizes vertical polarization response.
Improved rejection of Helicopter rotor modulation.
Lightweight.
Rugged aluminum alloy construction.
Excellent Gain for maximum range.
Designed to MIL-STD-810 environment.

	21-20-14
Model #	21-20-14
Brand	Cooper Antennas

Frequency	108 - 118 MHz
Gain (typical)	0 dBi nominal
VSWR	≤ 5.0:1
Impedance (nominal)	50 Ohms
Efficiency	≥ 95%
Polarization	Horizontal
Cable Harness length	45 inches nominal
Antenna RF Connector	TNC Female (on half loops) TNC Male (on cable harness)

Half loop Dimensions
Height	8.7 inches (221mm)
Length	17.0 inches (432mm)
Weight	2 lbs (0.91kg)
Base Plate Shape	Round (x4)
Fixing Holes (on each of 4 feet)	6 x Ø 0.201 inch holes on 2.312 PCD