VOR/LOC ILS Antenna System for Mach 2+ Aircraft

108 - 118 MHz and 328 - 336MHz

SKU: 21-20-85

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VOR/LOC ILS Antenna System

The 21-20-85 VOR/ILS LOCALISER AND GLIDESLOPE antenna system comprising of a pair of high-strength blades (P/N 21-20-85A and 21-20-85B) for horizontal mounting, one on each side of a vertical stabiliser, together with an external cable harness (P/N 21-80-56).

When installed, the blades act as a loop for VOR/LOC and as a forward looking dipole for GLIDESLOPE. The combined output from the 21-80-56 is connected to a diplexer (P/N 21-80-35) which divides the signal into separate VOR/LOC and GLIDESLOPE signals, both of which derive equally from each half of the antenna system.

Mechanical design of each blade comprises an internal printed circuit half loop, foamed-in-place into a high strength epoxy-glass radome fitted to an aluminum alloy base block having an integral mounting flange. Structural design ensures high side loading acceptance as required on high speed military aircraft. 

  • High strength lightweight fiberglass blades
  • Low drag
  • High ratio between horizontal and vertical polarization
  • Environmental Design to MIL-STD-810
  • Loop design for omnidirectional VOR/LOC pattern
  • Fully sealed for environmental integrity
Model # 21-20-85
Brand Cooper Antennas

Localiser : 108-118 MHz

Glideslope : 328-336 MHz 

Gain (typical) 

Localiser : -5 dBi

Glideslope : -5 dBi

(Antennas only, excluding cable harness losses) 


Localiser : ≤ 5.0:1

Glideslope : ≤ 3.0:1 

Impedance (nominal) 50 Ohms
Polarization Horizontal

VOR/Localiser : Omnidirectional

Glideslope : Forward looking lobe 

Antenna RF Connector  TNC Female
System comprises of

Qty 1 - 21-20-85A (Antenna)

Qty 1 - 21-20-85B (Antenna)

Qty 1 - 21-80-56 (Cable harness)

Qty 1 - 21-80-35 (Diplexer) 

Construction High strength fiberglass moulding
Height 6 inches (152mm) for single antenna
Weight 1.8 lb (0.8kg) for single antenna 6 lb (2.71kg) for system
Fixing Holes 4 x Ø 0.209 inches (5.3mm) holes, counter sunk 100° Ø 0.413 inches (10.5mm) 


  • Blue Grey
  • Other finish options are available.
  • Please specify finish required when ordering.

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