different type of rain fade - warping post.
turns out, my dish needed tweaking.
Yesterday, via swingplayer, I checked my signal strength quality on 2 different F1 channels
ch 266 (golfHD) strength 62, 2.3dB
ch 417 (Sportsnet Ontario) 68, 7.5
tweaked the dish when I got home, got 90, 9dB on channel 266 today with clear skies. F2 channels are all still good.
Guess my 6x6" post is warping due to all the rain. The warp in the post had turned the dish about 1-2 degrees to the East. I just tweaked it a bit to the west, and it's good now.