[Hieb]

Another thought--active RFID. I don't know much about implementation--just brainstorming--but reading the wikipedia entry on active RFID mentions a range of up to 300 feet, can be the size of a coin, and cost a couple of dollars for the tags. Something like that could be sewn into the uniform so it wouldn't present an injury risk like a braclet or necklace, and each player on the floor could have a unique ID for tracking the entire team or both teams.