I am 45 miles west of CBET, just north of Ann Arbor, and I discovered an interesting cause and cure to my intermittent Channel 9 reception problem.
It was frustrating; sometimes excellent signal strength on Channel 9, but sometimes it would drop to no signal at all. Recently, when it happened again in the middle of watching the Red Wings game on Ch-9 I realized that I was losing the signal when the lights in the upstairs bathroom were turned on. That bathroom is directly under my rooftop, Digitenna DUV-XF antenna. Turn the lights off, Ch-9 reception returned.
Here's why... I had replaced all four of the incandescent ceiling mounted can lights in that bathroom with new Sylvania RT6 LED lighting inserts. The LED lighting looked great, gave off very little heat, used very little electricity, produced a nice light, but apparently gave off terrible electromagnetic interference near 190 MHz. I replaced them with good old fashioned incandescent bulbs and that solved the problem.
Two additional points of interest:
1) Signal strength of channel 2 (177 MHz) was only slightly affected by the LEDs, but not enough to completely lose reception.
2) Back of Sylvania RT6 has a sticker that claims FCC Rule 15 compliance: This devise may cause and must accept any interferrance. (Paraphrase)