Turn on your swr meter and watch that. Wet can make a wire antenna go all woogy, plus, wind can stretch them. The transmitter might have gotten hot too. You need to watch power out, swr, alc, and muf all at the same time, along with final temp.
73 de kc4bo
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The tuning of the antenna can have an effect. If its raining or snowing it can alter the tuning of the dipole, lowering its resonant frequency.
