The KPA500 at the station only matches the transmitter to the transmission line and likewise for the receiver.   It does not change the match between the antenna and transmission line, thus the SWR and related loss from SWR remains.

73

Bob, K4TAX

On 12/4/2023 8:07 AM, [email protected] wrote:
To me, it sounds like that when the ATU is inline (& I presume you let
it tune to that antenna at some point.? Yes/No?)
The antenna is better matched to the transmission line, so more of the
on-air "ambient" noise is delivered to the RX.
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