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You can always plug directly into the FM antenna. You have to be comfortable with accessing your antenna wire which plugs into the back of your radio;...

Do you have a car radio with an AUX or regular 3.5mm headphone jack in the front of it? Maybe some kind of ipod plugin? What kid of car are we talking about? Stock or aftermarket head unit?

I live in MA and I can tell you 94.9 works well.

For the rest of your trip, you can try using the siriusxm channel finder tool https://www.siriusxm.com/frequency

I have done the I95 trip from...

You mean dead air stations so you can transmit your sirius to your radio?