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Check your antenna. If the mast is not extended, your reception will be limited. try an AM station, usually a local AM station will still come in even with the mast down. Have you tried playing a CD (if equipped) ? If that plays well, you've confirmed lack of reception as the problem. If the mast is extended and you still do not have reception, the antenna plug my have come out of the back of the radio. The requires removing the radio to check.
here is some free advice, antenna boosters simply amplify the radio signal AND the static so there is no increase in sound quality, plus they pick up all that nice spark plug noise. the upshot is that if you spend money to buy one you will find yourself taking it back out and tossing it or pawning it off on some ****** via eBay.
no, GM producst are fairly eazy.
there is a trim piece that goes around the radio, held on by push tabs... just dont be afraid to tug at the panel. it will pop off..
then 2-3 bolts mounting the radio.
radio will slide out.
if the antenna is in the window, look for a thin filament where it has to jumper across from the body to the glass.. usually up high, and you'll need to remove the pillar trim.
Have you had any elecrical item replaced recently... ie alternator, battery, blower fan etc?
This will sometimes cause the ground path back to the battery to shift, or has higher magnetic interference than the oem unit.
Hope this points you in the right direction.
I charge $40/hr for troubleshooting which is the national average.
Your local stereo shop should be able to sniff out the problem for you n a reasonable amount of time.