Amp should be matched to radio..Ant depends on amp aize but if your gonna amp it may as well go atleast 500 watts or more..Taken a 100 ish watt radio and puttin on a 200 watt amp will help but sweet frig all..
Another good thing..Grounding..LOTS OF IT..I dont mean chassie to ant bracket either..Look up the term bonding...
Another thing to remember..If you dont have the ears to hear it,no sence in outtin a big mouth behind it..