Yah, same here, antenna on roof like normal, but going in a N or NW direction it will cut out, make a slight change in direction, it starts up again. It can be annoying at times.
Also, in forest trees, canyons, to be expected I guess.
While I have the antenna for the hood of truck, I have yet to get it installed so dealing with the normal one.
Most of the time, or or specifically all of the time not in the N or NW direction and I suppose NE too, the reception is fine, Sirius or whatever it's called..
As noted above, it's all about line of sight...
PITA going north though, heheh... so I guess I should just head south all the time to Tierra del Fuego.. SA