Reciever loses signal during daytime hours

I recently had my HD DVR receiver installed. During the times from about 10:30am till 6:30pm it loses signal completely. However, this only happens if it is sunny and clear outside. If it is overcast out and raining or night time the signal is fine. I also have a standard receiver that keeps its signal 24/7. I have switched cables in and out and they are all connected securely. I have reset the receiver multiple times and to no avail I keep getting "Searching for satellite signal... (771)" Does anyone have any suggestions?

Also, when i test the signal strength i get zeros across the board and they are very slow to appear.