Dick, lets not get personal here. Unicom as proposed by Airservices must adhere to MOS Part 139 Chapter 14. I suggest you read that and make up your own mind on how it would work in busy CTAF's. I have no experience with FAA unicoms so I cannot give and informed opinion on them - but as you have, I would like a detailed explanation of how they work and, as I said before, maybe it may be a much better system than the one proposed by Airservices which is so restricted by current legislation. I stand by my statement that Unicom as proposed and forced to adhere to MOS139 is untried and not proven in Australia but I suppose we will all find out after the trials. And further more, I couldn't care less about ex FSO"s or ATC's operating the service as long as safety isn't compromised and pilots approve of the service. That decision will rest with Australian pilots not me.