My organization (a school) has an FCC license for three frequencies used on our campus for handheld radios (safety) and CB radios (busses). We wanted to record and reflect (retransmit) these signals out over the web so that even those without a radio can listen in the event of an emergency.
I went out and got a scanner at Radio Shack and plugged in our three frequencies. This works like a champ! We hooked it up to a computer and with Icecast and Darksnow, we now have a working "listening post" on the web. The problem started when we tried to move this fully working setup from our office (on the top of a hill) into our data center (a metal box inside a concrete box inside a metal box in a valley). We lost all reception. The scanner has a coax-input however, so I got 50 feet of coaxial cable and ran it to a spot outside the building. Our reception improved significantly, but still isn't great.
The cable isn't plugged into anything right now, because I'm not sure what type of antenna to buy. Our frequency assignment is tight, three frequencies in the 490-500 Mhz range. I think we need something that is fairly omnidirectional. Ideally it would be something compact that won't draw attention or look like an eyesore. I'm having a hard time interpreting all of the information about antenna types.
Will a UHF TV antenna work? Should I be looking for something more specific?