i-Club - The Ultimate Subaru Resource - Really dumb question from a n00b

OK so I picked up an 05 rs, and the radio is reallllllly terrible , so I have another I would like to throw in hopeing that the sound quality will be better, speakers would help but thats going to have to wait. My question, which may sound ridiculous is - To remove the radio, the plastic surround has no screws, does it just snap out of the center? Thats it, I am embarrassed to even ask but I will be up the creek with no paddle if I booger anything up, and since I have yalls attention, any good mounting suggestions for a satelite radio antenna, I havent had a chance to poke around the car on the outside yet since its been too cold for me since I picked the car up on saturday. Thansk for any suggestions ( I did order a cd manual off of feebay, just isnt here yet)