There are a few topics on antenna alignment on Geekzone but none say whether one should exactly align the UHF antenna with a line of site tower (which is 2 to 4 km away) to get the best picture signal strength. Will the picture always have the optimal signal if its bar points directly towards the tower or will the signal sometimes improve if it is offset maybe 10 or 20 degrees or more?
The reason I ask is a relatives aerial points exactly at the tower but the signal strength is low. The cabling is old and needs replacing but I was wondering if moving the aerial from exact line of sight could perhaps boost the signal strength before I get on the roof and move it and before I get the cabling replaced.