Multi-band FM Communications Antenna

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Multi-band FM Communications Antenna

The 21-50-45 is a multi-band, vertically polarized communications antenna particularly suited to latest generation VHF/UHF FM/data link radios.

Designed as a short, top loaded monopole, excellent performance is achieved throughout the frequency range by use of frequency selective matching and decoupling circuits. Mechanical construction uses a glass reinforced thermoplastic shell with foamed-in-place internal elements. A single N-type connector is fitted to the aluminium base plate and is DC grounded for p-static protection.

Wide bandwidth covers all commercial VHF and UHF FM frequencies. .
Small size only 10 inches height.  25 watts power handling.
Can be used with external diplexer/ triplexer for simultaneous multiband operation.
Passive design does not require external tuning.
Designed to environmental requirements for helicopter and subsonic transport aircraft.

	21-50-45
Model #	21-50-45
Brand	Cooper Antennas

Frequency	136-174 & 380-870 MHz
Gain	VHF ≥ 0 dBi average UHF ≥ +3 dBi average
VSWR	≤ 2.35:1 136-174 MHz ≤ 2.0:1 380-520 MHz ≤ 2.4:1 760-870 MHz
Impedance (nominal)	50 Ohms
Power	25 Watts max
Polarization	Vertical
Radiation Pattern	Nominally Omni-directional in azimuth Elevation-see graphs
Antenna RF Connector	N Female
Temperature	-56°C to +71°C