Brian I also use a "C" antenna on 160 m with my K3 and I have not seen any problems with power reduction. I also have an ALS-600 Amp which is far more sensitive to SWR than the K3 on all bands. Bob KD8CGH -- View this message in context: http://n2.nabble.com/K3-160m-SWR-issue-tp3940644p3942928.html Sent from the Elecraft mailing list archive at Nabble.com.