wireless communication

can anybody suggest as to which means of wireless communication must be used as fast and reliable means of data transfer over a distance of more than 200 meters and available sites for finding the transmitter and reciever of the same. please note we are planning to impplement the same in our project.All suggestions regarding the modulation to be used, the coding technique to be used are welcome.

thanx in advance

I don't know well but Ithink if you use high frequency and use am modalation you can have a range more than 200 m

You don't have your location filled in, so search your own country for "licence free radio modules".