What you need is an Amateur Radio enthusiast as One of your forum members, it might also help if One of his past occupations was being a Sound Engineer as he would know the theory of this kind of venture..lol.
Yes, you can do it - you just need to buy or build a 'Yagi' antenna (Thats what a TV antenna is - Directional).
You do need another to receive of course - the problem is it MUST BE in the 'Line of Sight' to work.
There will be commercial offerings.
You see those little 'Wi Spire' dishes around - thats what they are doing, all pointing to the Spire where the transmitting antenna is situated.