The 18 feet indicates it could be a half wave CB Antenna, but to be su

Borrow an Antenna Analyzer such as MFJ-269 and find the resonant frequency
of the antenna.
Most Hams will be happy to help and make the measurements for you.
An Antenna Analyzer is a better way of testing as you don't have to
transmit.

Once you know the resonant frequency of the antenna.

See Ham Band plans at URL:
http://www.icomamerica.com/downloads/bandchar.pdf

See CB Frequencies at URL:
http://listen.to/welfarewally

For any others, see FCC Spectrum Chart - URL:
http://www.ntia.doc.gov/osmhome/chp04chart.pdf

--
73 From The Signal In The Noise
Caveat Lector Ya All
----------------------------------------------------------------------------
"PC" wrote in message
news:hL79b.449290$uu5.79598@sccrnsc04...
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