Hopefully that helps.
As far as the antenna goes I have had a lot of radios that would not work with out it being hooked up. I have had a lot that worked with out it hooked up. Best advice I can give you is to hook it all up and the antenna as well and then try it.
1997 F-350 cclb 4X4 460 E4OD 4" LIFT 35X12.50X16 OBD1
1977 F-350 cclb 2nd 460 C6 Ranger XLT
1995 EXTRA CAB s/b 2wd 2.3
1971 Safari Fiberglass buggy
1969 Chevy C20 factory A/C long bed
1933 Chevy Pickup