i have a aftermarket HU and i get crappy reception but if i hold the antenna it gets better reception, what can i do to get better reception?

 

Would you know how to change your antenna to something like a power antenna? If not, crutchfield sells this antenna booster which is really simple to install. I can't say forsure that it'll do the trick, but if you don't know wut you're doing, this is better than nothing. Crutchfield Antenna Booster