VHF/UHF Airborne Blade Antenna
108 to 174 MHz & 225 to 400 MHz
The 21-50-43 is a dual band VHF/UHF communications antenna intended for use on high speed aircraft . Its construction is from precision machined aluminium alloy with high strength glass/epoxy inserts. Having a low profile diamond shape raked blade structure minimizes drag for high speed applications and presents a low Radar Cross Section (RCS). The aluminium structure also lends itself to the application of certain types of ’stealth’ radar absorbing material.
The electrical design comprises a UHF sleeved unipole, the upper element of which acts as a "choke" enabling a capacitive horizontal rod to operate as a top loaded VHF monopole, decoupled from the UHF section.
Designed and constructed to meet MIL-STD-810 environmental conditions, the 21-50-43 is a drop-on footprint replacement for UHF blade type AT-256, having a single N-type Female connector. The antenna is normally finished in lusterless grey urethane paint.
108 - 174 MHz
220 - 400 MHz
108 - 174 MHz -2 dBi min 0 dBi average
220 - 400 MHz 0 dBi min +2 dBi average
108 - 115 MHz ≤ 3.0:1
116 - 174 MHz ≤ 2.5:1
220 - 270 MHz ≤ 2.0:1
271 - 375 MHz ≤ 2.25:1
376 - 400 MHz ≤ 3.0:1
|Impedance (nominal)||50 Ohms|
|Power||50 Watts max|
|Radiation Pattern||Nominally omni directional in azimuth plane|
|Antenna RF Connector||N Female|
|Antenna Shell Type||Diamond shaped aluminium alloy with fibre glass inserts|
|Height||12.42 inches (315 mm)|
|Weight||2.2 lbs (0.99 kg)|
|Base Plate Shape||Diamond shape drilled to replace AT-256|
|Fixing Holes||6 x Ø 0.200 inches (5mm) holes, counter sunk at 100° Ø 0.39 inches (9.9mm)|
- Urethane Lusterless Grey
- Other finish options are available.
- Please specify finish required when ordering.