I have a Radio Shack "swept wing" type VHF/UHF/FM roof antenna, about 20 feet from ground. In recent months, high VHF stations (7, 9, 11, 13) have become very erratic, with 7 and 9 sometimes dropping out entirely. As far as I am able, I have aimed the antenna at the recommended azimuth (43-44 degrees). I've tried rotating the antenna on either side of this - makes no difference. Day or night doesn't seem related.
Here is the link for the signal at my location:
http://www.tvfool.com/?option=com_wr...d243b930ff8b56
I'm pretty naive - do antennas "wear out?" It's about 14 years old. Any other explanations/suggestions much appreciated.
Thanks very much.