My system in all RG-6. Reason being Pri-antenna is 300ohm which requires 75ohm coax. The scanner will never know if you have 75ohm cable hooked up. The loss is within reason and rated to 950MHz. Have several other ant's and use TV/VCR type splitters and ABC switches. I live in a strong signal area and never notice any loss with my hook ups. With this set up you have more options for installations. Good Luck, Larry