I live about 15 miles from all my stations. I have five important stations all about 187 degrees from the house. Channels 2.1 and 6.1 are the weakest at 17.0 NM. channels 8.1,10.1 and 12.1 are the strongest at 33NM. The weaker channels show a signal strength of 45% and the stronger channels show a strength of 75%. I am using a Winegard flatwave air 6550 antenna pointed in the direction of the stations 187-190 degrees. I live in a creek bed about 100' below the horizon.
http://www.tvfool.com/?option=com_wr...5b94a2230f9396
When the temperature drops below 20 degrees F., the two weaker channels become quite strong (80%) and the normally three strong channels disappear all together. I have tried moving the antenna around but they just don't exist below temps of 20 degrees. When the temp goes up, the original situation is restored. Do you have any idea why the loss of those channels?