I'm a truck driver and I just got a brand new Sirius Edge radio for my 2012 Volvo. I got the bracketed mirror mounted antenna after the smaller magnetic mounted antenna that came with the radio was found to be lacking. The new antenna is better, but sometimes the truck's superstructure still blocks the signal. And we're talking flat desert I10 going through Arizona and New Mexico. Where and how is the best place to mount an antenna on a big truck. Also, is it possible to install two antennas (on on either side of the truck) and then run them to the radio through a splitter? I can only see this problem getting worse in mountainous terrain if I don't fix the problem. I could really use some tips.