Satellite radio

Whatever way you choose, be sure to use silicone to seal it. Water will go through any cracks there are. On top of the roof is the "cleanest" way to go.

Should have mentioned that it is an aluminum roof

On my trailers I liked to drill through the sides of the trailer up near the roof line. Most of the time this will go into a ceiling mounted cabinet on the inside where you can route the cable where it needs to go...

These are for radio scanners and Ham radio things... The SAT RADIO antenna you will probably need is not a whip mounted type and probably should be on the flat roof. I hate drilling anything through the roof area...

This is on my 5th wheel...

Roy's image

This is on my POPUP trailer...

Roy's image

Roy Ken

If Roof is NOT metal (IE: Fiberglass or rubber) try putting the antenna inside, on top of whatever you can put it on top of. Sat TV receiver, Radio stack, one of the small shelves next to overhead compartments.

I used a small square of 3M tape and silicone sealant to affix the antenna to the top of my fiberglass front cap. I routed the wire along the fiberglass front cap/aluminum roof seam and sealed over it with Dicor. The wire routes down the rain gutter above the driver's door and enters through the door behind the rubber seal. I used a short piece of wire loom to give a little extra protection to the wire when opening and shutting the door. Then it's just a matter of routing it under the dash to where you locate the XM unit.

I routed the antenna wire under the dash and up the center post in the windshield in our Itasca. A large part of how you route the wire will depend upon what you have to route it in and behind. You could if necessary use a stick on wire chase.
You also need a place for the antenna to mount. I used the blade from a large metal spatula that I managed to slip up into the overhead structure. It got me well up under the fiberglass roof with nothing else in the way. It was a FUN job, but it worked for 7-8 years. Actually thinking of doing it again in our new rig. Why pay the $$$ for two? I can get a modern XM receiver and use it in my car, the Toad and the RV all for a single price. Save a bunch of cash. We don't listen to the radio too much when parked, usually just while driving.

Note that your antenna does not have to on the roof if it is a fiberglass roof...or inside the front cap...I'd try that first before drilling a hole.