It is probably a CB antenna. Have someone with something like an MFJ
ANTENNA ANALIZER check the antenna and find resonant frequency.
If you can find a make or model number on the antenna you may find it on
the internet!

Les, AA4F

PC wrote:
I purchased a home and an antenna came with it. I don't know what the
original owner used it for and I'd like to find out what kind it is. It's a
verticle antenna mounted on a pole, the mast extends about 18 ft. up. At
the base it has three rods about 9 ft. long stretched horizontaly and at the
very top it has three 12" rods horizontal. The coax attaches to the bottom
and runs into the house, Is this Ham, CB or something for a scanner? Is
there any way of finding out?

Thanks