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2. Antenna array - Wikipedia

   en.wikipedia.org/wiki/Antenna_array

   An antenna array (or array antenna) is a set of multiple connected antennas which work together as a single antenna, to transmit or receive radio waves. [ 1 ] : p.149 [ 2 ] The individual antennas (called elements ) are usually connected to a single receiver or transmitter by feedlines that feed the power to the elements in a specific phase ...

3. Antenna diversity - Wikipedia

   en.wikipedia.org/wiki/Antenna_diversity

   A wireless microphone or sound system using diversity reception will switch to the other antenna within microseconds if one antenna experiences noise, providing an improved quality signal with fewer drop-outs and noise. Ideally, no drop-outs or noise will occur in the received signal.

4. Long-range Wi-Fi - Wikipedia

   en.wikipedia.org/wiki/Long-range_Wi-Fi

   High gain antenna may be of many designs, but all allow transmitting a narrow signal beam over greater distance than a non-directional antenna, often nulling out nearby interference sources. Such " WokFi " techniques typically yield gains more than 10 dB over the bare system; [ 6 ] enough for line of sight (LOS) ranges of several kilometers ...

5. Zero-forcing precoding - Wikipedia

   en.wikipedia.org/wiki/Zero-forcing_precoding

   Zero-forcing (or null-steering) precoding is a method of spatial signal processing by which a multiple antenna transmitter can null the multiuser interference in a multi-user MIMO wireless communication system. [1]

6. Wireless microphone - Wikipedia

   en.wikipedia.org/wiki/Wireless_microphone

   Wireless microphones usually use the VHF or UHF radio frequency bands since they allow the transmitter to use a small unobtrusive antenna. Cheap units use a fixed frequency but most units allow a choice of several frequency channels, in case of interference on a channel or to allow the use of multiple microphones at the same time.

7. Wireless Communications of the German Army in World War II

   en.wikipedia.org/wiki/Wireless_Communications_of...

   It was used with antenna of either 1.4 to 2.0 metres antenna. Used by anti-tank units. FuSpr.f: A mid-band HF transceiver. It operated in the 19,990 to 21,470 kHz (19.99-21.47 MHz) frequency range with a transmission power of 5 Watts. It was used with antenna of either 1.4 to 2.0 metres antenna.