Plain-language answer: A tuner at the feed point transforms impedance before RF enters the main feed line, which can reduce line loss when the antenna impedance is far from the cable’s characteristic impedance.
Why it matters
A shack tuner can make the radio happy while the coax still carries high standing waves and loss. Feed-point placement does not remove antenna loss or common-mode current by itself.
Put it into practice
Compare the complete system on the intended bands, use a weather-rated tuner, provide the required return path and choke strategy, and measure delivered performance.
The common mistake
Calling lower feed-line SWR proof that the antenna itself became efficient.
System boundary
Current channel authorization, waveform specifications, radio and tuner manuals, electrical code, exact antenna configuration, and tested interoperability control. A stored match or automation result does not prove radiated efficiency or network readiness.
