removing radio

[67gmcss]

sorry...i know this belongs in the other room, but there isn't anyone over there and i am in a bind nad need to do this tonight....i have a 94 suburban and bought a cd changer at walmart....it hooks into the antenna and then into the radio to work....i can't find where the antenna hooks in at on the back of my radio...i have it loose enough to rock back and forth but can't seem to get it on out.....any ideas from anyone where i am screwing up at or any pics of one of those year radios out so i can get a look at what i am up against....i will relate it to our year trucks with this----this project makes me almost enjoy doing something on the 67...almost.... nice metal dash w/o a thousand wiring harnesses and plastic plates that block your view and ability to move around....heck, you can lay on your back and just about see the entire back of the radio on the 67.....maybe i shoud just stick it that truck and forget it, but then the wife would kill me...thanks in advance