periodic low signal issues in East Troy

[bigbwb]

Hello guys,

For the last several years I have been using a large bow tie type antenna with an amp that was recommended to reach the Milwaukee stations from my house(East Troy) about 35-40 miles out.  The setup goes into my Directv HD box and normally works fine.  Recently over the past few months I have been struggling to get a solid signal from several channels(12, nothing from 18 at all) and etc.  I did not change or move anything in my setup.

Any suggestions?

I used to get 80-90% signal strenght on most of the locals and now ch 12 hovers between 60-70% and nothing for 18?

Thanks,
Brandon