I'm assuming that when you say "Community Radio", you are speaking of a transmitter operating in the standard FM broadcast band of 88.1 through 107.9 MHz?
I have a couple of transmitters that I use for festival use and, although I purchased a couple of antennae, I built the ones that I use the most often. FWIW - all of my transmitters have a standard 50 Ohm output.
The antennae that I purchased are two distinct styles: one is a monopole, the other looks like a pair of folded dipoles crossed in the exact shape of a "X".
The monopole has an omni pattern, the circularly-polarized antenna has a figure 8 pattern. I'm guessing that the monopole is actually configured as a half-wave dipole but I didn't look inside the (sealed) pole to see how it was built.
Both of these have an external balun in a sealed package - I haven't bothered to open either of them up to see how they are constructed. I will, someday.
The antenna that I use the most often is a simple dipole made with 2- fairly-long telescopic antennae mounted on a small project box. The hot antenna points UP, the ground antenna points Down. No matching network of any sort - both of the telescoping poles simply connect to a BNC connector.
I found a table of length adjustments that allow me to set the telescoping lengths to match the frequency that I am transmitting at. Interestingly enough, the downward-pointing telescoping antenna (ground) is a different length than the upward-pointing antenna.
The table seems to be fairly accurate - I normally get reflected power of less than 1 Watt with a forward power of 30 Watts. I simply tweak the antenna lengths to minimise the amount of reflected power if the antenna is too close to some other grounded object that messes up the tuning.
I normally mount the FM Transmitter antenna from the very top of the Front Of House mix position. There is usually a structure above the mix position that houses two or three spotlights (with their operators) and I'll simply hang the antenna from the roof of that upper structure.
I haven't gone looking lately, but I'd think that there is a ton of information just a short Google search away.