I installed a "Roady" a few months ago in my 02 C320. I used the cassette adapter and mounted the unit on the center-left dash vent with the provided clip. The FM modulator worked so-so, but the cassette adapter was 10 times sharper. I ran the antenna wire up under the dash, tucked under the door sills, under the back seat and thru the trunk up to the roof by the existing stub antenna. I notched the metal under the trunk seal and ran the wire up around the rear window seal. Can't see it unless you realy look close and it says put in the "channel".

Buy the remote. It beats fumbling with the awkward controls on the Roady.