I have Sirius in my ride too. I have my antenna in the rear, above the rear windshield. Tuner is in the trunk.
Personally, I wouldn't put it in plain view, then theives can see it, know you have good audio, and steal something.
Only place to mount it IS in plain view. However, I believe there is a low-profile antenna available, plus you can paint it to match the car if you want to go stealth. If thieves do end up jacking the system, it wont work for them, and here are the reasons why:
1) The coaxial lead for the antenna is very thin and kinks very easy. If a thief wants the ant, he will have to take his time undoing what you did in order to route the lead, which usually involves going around the windshield glass and in the trunk.
2) You cant use satellite radio without a head unit. Kenwoods can be set with a code, that unlike the Delco-Locs, CANNOT be reset once inputted. The thief couldn't even pawn it unless he knew the code, and how to input it.
3) When you activate the service, you have to give them a code, called the ESN. It is a serial number burned into the satellite receiver unit, which cannot be changed. This lets them be able to beam down your signal to your unit. The flip side to this is it sort of also acts like a GPS...if they wanted to, they can track your movements with the car. If said thief succeeds in getting around items 1 and 2, you can call Sirius themselves about the problem. I would think they could either permanently ban that ESN from being activated or wait until it has been turned back on, and track it.
Man, that was longer than I thought it would be. I have had my service for a year now, and not one break-in, and Daytona really isnt known for its lack of crime...plenty of sirens everyday here.
Welcome, downwardly mobile yuppies, to the dawn of the Age of Nefarious.
1993 SSEi - FrankenJinx - dead and gone.
1994 SSE (136K strong) - 180* t-stat,HD alternator, most unequipped SSE on the club, XM radio, Kenwood CD/MP3.
2006 Chevy Malibu Maxx LTZ - Custom 2.25" manifold-back exhaust w/FM-80. Probably the only Maxx with this system.