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2. Very high frequency - Wikipedia

   en.wikipedia.org/wiki/Very_high_frequency

   The VHF band is the first band at which efficient transmitting antennas are small enough that they can be mounted on vehicles and portable devices, so the band is used for two-way land mobile radio systems, such as walkie-talkies, and two way radio communication with aircraft and ships (marine radio).

3. AN/ARC-231 - Wikipedia

   en.wikipedia.org/wiki/AN/ARC-231

   The ARC-231 Skyfire is a software-definable radio for military aircraft that provides two-way, multi-mode voice and data communications over a 30 to 512 MHz frequency range. It covers both line-of-sight Ultra High Frequency (UHF) and Very High Frequency (VHF) bands with AM , FM and SATCOM capabilities, [ 1 ] including Integrated Waveform (IW).

4. Two-way radio - Wikipedia

   en.wikipedia.org/wiki/Two-way_radio

   Naval air traffic controller communicates with aircraft over a two-way radio headset A variety of portable handheld two-way radios for private use. A two-way radio is a radio transceiver (a radio that can both transmit and receive radio waves), which is used for bidirectional person-to-person voice communication with other users with similar radios, [1] in contrast to a broadcast receiver ...

5. AN/ARC-210 - Wikipedia

   en.wikipedia.org/wiki/AN/ARC-210

   The ARC-210 is a family of radios for military aircraft that provides two-way, multi-mode voice and data communications over a 30 to 512+ MHz frequency range. It covers both Ultra High Frequency (UHF) and Very High Frequency (VHF) bands with AM, FM and SATCOM capabilities. [1]

6. List of military electronics of the United States - Wikipedia

   en.wikipedia.org/wiki/List_of_military...

   VHF/UHF/SATCOM two-way, multi-mode voice and data radio communication system: E-8 Joint STARS: Rockwell Collins: AN/ARC-231: Skyfire VHF/UHF/SATCOM two-way, multi-mode voice and data radio communication system: BAE Systems: AN/ARC-232: Very High Frequency (VHF)/Ultra high frequency (UHF) radio communication system: Raytheon

7. Rubber ducky antenna - Wikipedia

   en.wikipedia.org/wiki/Rubber_ducky_antenna

   Before the rubber ducky, antennas on portable radios usually consisted of quarter-wave whip antennas, rods whose length was one-quarter of the wavelength of the radio waves used. [1] In the VHF range where they were used, these antennas were 0.6 or 0.9 m (2 or 3 feet) long, making them cumbersome.