I can't get a good signal from all the local Portland AM radio stations.
Two stations come in OK but with all that background buzzing noise. Others barely come in.
Tell me about how to build a good antenna w/o major expense - no Ham antenna instructions, please.

I hear that a simple loop would work, but I'd like to have the stations come in as clear as possible. Would a loop do that?
Would the old TV dipole work as good as it can get w/o a major build?
There's a TV antenna on the roof with its coax still attached...what about that?
I don't want to spend $30 - $40 on a Radio Shack item that may or may not work.
FM antenna, too. 'Need a good FM antenna.
Thanks.
Regards,