FM frequencies should be tuned to odd numbers as there are a lot of radios that won't be able to tune correctly.Have you had any issues using a .0 ending? We had an .even number for one year only and had people suggesting they couldn't tune in on their digital radios in the their cars. Changed to a .odd ending now with no issues.
Does anyone know how much it costs for a license? The other option could be that we find a frequency that isn't used across all of Australia and then get a license for that exact frequency and then everyone that broadcasts chips in for the fee.Yeah it is a nice idea @Kitman. Ideally if everyone participating had a small enough transmitter (no 1.5W, 7W etc..) it might be workable .
The EDM units would be ideal as their power is fully adjustable up/down between 1mW and 100mW. Too powerful of a transmitter with another animated display nearby and it is going to dominate the frequency in areas where it shouldn't. Even forgetting the legal issues for the time being, there's no need to buy/use a transmitter that broadcasts for ages and ages past the viewable area of a Christmas display, IMO.
The above idea might not work in your case and it may not work for every situation where people are very close to each other, however, if everyone limited the range of their transmitter then it could be workable??Derf is to close to me and has a transmitter that would wipe me out so we are on different freq