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As for whats the ground plane? My newest inhereted car a 1985 Buick Riviera with 62,000 original miles and it's loaded! Uncles old car as he decided it was time for a Caddy. I am thinking about a RCI 2970n2 and through reading on another post on here I got into the whole impedance matching info and wondered if it would benefit me at all. Right now my Magnum 257hp is in it with a Wilson 1000 magnetic as I can't decide where or how I want to mount my antenna.