i currently have an old alpine HU (a TDA 7524 if i'm not mistaken) and i'm thinking about getting a Clarion DB336MP from ebay ($118 + $20 S/H + whatever Johnny-Air will charge for overseas shipping) or locally if the price is ok.

my question is, are these compatible? i want my power antenna to continue to work. :D of course i would not need the HU and CD changer anymore ("i don't need no steekin' changer, i have MP3 capability!")