@David09 - I don’t know much about the AM band, but I bought an RF modulator six months ago to convert the TV signals in my house and push them through coaxial cables into another room.
These little gizmos are gems. You can hook up anything—TVs, DVD players, video games consoles, you name it-and they’ll convert the signal so that they can be transmitted to another location via coaxial cable.
For example, if you have a new DVD player but an old TV set, you can feed the audio video signals from your DVD player into the coaxial input for your TV and it will transmit the signal.
I got mine for under $30 and it works flawlessly.