A 73cm dish should be OK for the location.
How are you measuring the signal..... with a satfinder/meter or just looking at the signal scale on the screen?
Have you adjusted the LNB skew to optimise signal quality?
Have you checked all cables for shorts or open circuits?
Do you have another known-working decoder you can test on his dish (can be for VAST or Aurora).
Can you test his VAST decoder on another known-working dish setup?
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