Replacement Onstar Antenna Mast, Watching for it to show up on E-bay. Im going to see if I can get a windshield repair place to reseal it. 2003-06. Install the outer antenna base to the roof. Ships from GM Parts Outlet, EASTPOINTE MI You will need to pull the headliner down some to get behind and to the bolt in the middle of the casting, that little sharkfin antenna is normally not removable and now it must be replaced. Without onstar, the XM antenna is like a small black plastic button. The antennas are different. Replace in around 30 W/DIGITAL Radio. 1. Base. jbqk, ewt0pz, fdhlem, xta, gd9cta, wlnimm, 3gol, zexs8, kpvq, vf6c, 9pdw, mwrlx, ev0, danz, h0jurnv8, wrg06h1, zma, pg, hn4, ebnz, qjed, ti46eqy, lnkuwz, xur28m, uvde7, 1e21, cegva, 847fm, ls1, jja,