I haven't followed this thread very closely for quite a while so I'm not familiar with your situation. Can you please tell me a few things:
How many DHGs do you have (and what size?)
Are you getting TVGOS via OTA?
Is your DHG connected to an antenna or Cable?
If you'd like to tell me which part of town you live in (or send me a PM) perhaps we can setup a time and place to meet and I'll loan you one of my DHGs to test at your house (and maybe I'll try yours at mine) to...