I know that the RG6 from the LNB to the Receiver must be grounded through a grounding block. My question is how far / or close does the grounding block have to be to the LNB's? Can I run a long RG6 30 Ft. before attaching to the grounding block and the LNB? In other words LNB---30Ft RG6---Grounding Block then from the Grounding Block to the reciever? Also is it ok to bury standard RG6 in the ground?