still don't know what is best type of radio/antenna ?

Must come with the radio mine did. Belive they are the same as a car set up.

what make of radio and antenna ? did you buy from Sirius directly ??

The one on my boat is a Clarion reciever and it has an 18" rubber antena mounted on the side of the cuddy cabin. That is the set up from the Key West factory.

Its a jenson msr3007. The antenna looks just like the ones used on cars.