Bad TV reception

I was wondering if any body else in Yass is experiencing very bad free to air television reception. Because I live near the River I expect to live without SBS and a continual ABC coverage but the rest of the stations are a disaster most of the time. I spend my time reading sub titles and they don't always work. Could some body explain to me why at 6.00PM everything returns to normal so I can watch the news, it's like a booster has been turned on. For the last two weekends I have completly lost all coverage of anything other than Channel Ten and that has continued to Monday as well. Atleast when we had analogue I could switch between the two signals to pick up 10 and 2. Where does the signal come from and why can't it be intensified so we can all enjoy all stations on free to air without interference to the signal.

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