What the thread found

• An antenna operates optimally only at its design frequency, with performance degrading significantly as distance from that center frequency increases.
• Antennas with poor frequency matching cause high standing wave ratio, which robs transmitter power and converts it to heat, potentially losing over 50% of output power especially with multi-channel systems.
• High-quality transmitters include tuner circuitry to prevent damage from high impedance mismatch, but this does not recover the lost power delivery to the antenna.
• Optimal antenna performance is achievable within approximately 5 MHz of either side of the tuned frequency.
• Custom-manufactured antennas tuned to specific frequencies can provide better performance than single antennas attempting to cover a wide frequency range like the approximately 225 MHz span of a modulus transmitter.
• Quarter-wave 440 MHz slim-line antennas can be custom-manufactured to specified frequencies at approximately $16 with BNC connector.

Depends on

• Discussion from 2007, specific to older video transmission technology.
• No measurement data provided to quantify the performance improvement from custom tuning versus stock antennas.
• The 50% power loss figure is presented as an example for worst-case scenarios but not systematically documented.
• Specific transmitter models and their tuning effectiveness are not detailed.

Gear in this thread

Moduluscatalog

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