It turned out that the problem was the quantity/quality of connections we had in line between the decoder and the loop. I ran a fresh 250' line of RG-6 straight from the decoder to the loop and it works awesome now. In fact I can raise the loop another foot or two and still get good reception. Bottom line is use RG-6 or RG-59 and use up to 100 meters (~330 ') with no connectors. Perfect reception!!