Multi-Band FM Communication Antenna

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Multi-Band FM Communication Antenna

The 21-50-45-2 is a multi-band, vertically polarized communications antenna particularly suited to latest generation VHF/UHF AM/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.
Meets MOPS for VHF ATC per DO186B
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.

	21-50-45-2
Model #	21-50-45-2
Brand	Cooper Antennas

Frequency	118-174 & 380-870 MHz
Gain	VHF ≥ - 2 to 0 dBi UHF ≥ +3 dBi average
VSWR	≤ 3:1 118-136 MHz ≤ 2.5:1 136-174 MHz ≤ 2.5:1 380-870 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