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2. Hidden node problem - Wikipedia

   en.wikipedia.org/wiki/Hidden_node_problem

   Hidden nodes in a wireless network are nodes that are out of range of other nodes or a collection of nodes. Consider a physical star topology with an access point with many nodes surrounding it in a circular fashion: each node is within communication range of the AP, but the nodes cannot communicate with each other.

3. Transmitter hunting - Wikipedia

   en.wikipedia.org/wiki/Transmitter_hunting

   Transmitter hunting (also known as T-hunting, fox hunting, bunny hunting, and bunny chasing), is an activity wherein participants use radio direction finding techniques to locate one or more radio transmitters hidden within a designated search area.

4. GCHQ Bude - Wikipedia

   en.wikipedia.org/wiki/GCHQ_Bude

   The different types satellite receivers at GCHQ Bude; including 'naked' parabolic antennas along with hidden antenna covered by a radome. GCHQ Bude station comprises twenty one satellite antennas [ 1 ] of various sizes, including three that have a diameter of 30 m (100 ft), that could theoretically cover all the main frequency bands: L band , C ...

5. T2FD antenna - Wikipedia

   en.wikipedia.org/wiki/T2FD_antenna

   The T²FD is useful for hidden indoor systems, or where several optimized frequency-specific antennas cannot be accommodated. For example, an indoor antenna only 24 feet long will allow operation on all amateur HF bands above 14 MHz on transmit, and down to 7 MHz on receive. [citation needed]

6. The Thing (listening device) - Wikipedia

   en.wikipedia.org/wiki/The_Thing_(listening_device)

   The antenna was capacitively coupled to the post via its disc-shaped end. The total weight of the unit, including the antenna, was 1.1 ounces (31 grams). The length of the antenna and the dimensions of the cavity were engineered in order to make the re-broadcast signal a higher harmonic of the illuminating frequency. [6]

7. Antenna (radio) - Wikipedia

   en.wikipedia.org/wiki/Antenna_(radio)

   The antenna gain, or power gain of an antenna is defined as the ratio of the intensity (power per unit surface area) radiated by the antenna in the direction of its maximum output, at an arbitrary distance, divided by the intensity radiated at the same distance by a hypothetical isotropic antenna which radiates equal power in all directions.