No sorry you can't use the antenna on your roof to pick up AM, the
frequency is way to low. AM is aprox 1 Mhz and your tv antenna would be
aprox 100Mhz. I can't give you any advice on how to get around this
either, sorry. I can't see how Aluminium wiring would cause a hum
problem, I'd try to relocate the receiver or at least it's loop antenna.
Regards
Stuart

john pearson wrote:
>
> I want to get AM on my reciever/amp. I have a coax 75 ohm cable comming from
> a TV antenna on the roof into the 75 ohm FM input on my reciever. Can I
> split that coax line and make a connection to the AM antenna input on my
> reciever along with the FM input. If I can, would I split it with one of
> those 75/300 ohm splitters and put the 300 ohm end into the AM input?
>
> Oh, the little loop antenna I got with the reciever doesn't work well. It
> picks up a loud 60Hz hum from the house wiring. Would aluminum wiring cause
> this?
>
> Thanks
> John