Where do you have your satellite radio antenna installed?

Inside the roof above your head.

 

The Sirius gets its signal from a further south satellite....XM in a little more south west.
So the Siruis signal is a little lower on the horizon from XM..

 

Nope.

XM satellites are geostationary (over the equator) at 85° (south of Tallahassee) and 115° (south of Las Vegas).

Sirius satellites are in a highly elliptical Tundra orbit, and spend most of their time hovering over Manitoba.

 

Where exactly is the antenna on a 2017 Kenworth T680? I don't even see it. Just got the truck, and this signal crap sucks!!

 

The 2015 T680 I was driving did not have XM radio but I think it is part of the integrated antenna,
Probably under the head liner somewhere..

 

Heck,I use the little disc car antenna....3M 2 way tape to the mirror arm or top of visor and it always worked fine.
I never needed the big antenna.
The truck in my sig pic it is on the top of the mirror over the passenger door.

 

It's stock so on the roof.

 

I use the stock antenna, 3m double side tape and stay all season and truck wash. I also have a midroof truck so it's kinda flat on top.

When I had a condo or a midroof with fairing, I use a bird perch mount and it work fine.

 

Look at the CB section of any Truck stop and find a silver Volvo straight bar about 6 inches long.... You can remove 1 bolt from the right side blind spot mirror over the passenger door...it screws right in and there you go....