When Antennas Attack

My most recent Parks on the Air (POTA) activation, an overnighter at Chino Hills State Park US-1139 on the weekend of 15 and 16 February, 2025, was a blast, but not without its challenges. During the evening hours, US Pacific time, I experienced a mysterious increase in SWR, and a resultant decrease in transmit power as my transmitter automatically rolled back the power to protect itself. It cost me at least one QSO, as I heard a station repeatedly trying to reply to my CQ with me unable to complete the exchange. As I like to say, I'm not a real engineer. I'm a graduate of a liberal arts school and a software engineer by trade. Someone more knowledgeable might be able to expand upon—or refute—my analysis of what happened. For now, here's what I think went wrong. Background Contest The weekend in question was the weekend of the ARRL International DX Contest, CW. The CW portions of the non-WARC bands were wall to wall with contest participants, making frequency selection for ...