sterile airspace xinhau???? Methinks you are giving UNICOM extraordinary powers.
The Unicom Services concept involves a skilled Unicom station operator providing the following information:
Advisory traffic information in the immediate terminal airspace and movement area.
Meteorological information such as factual statements about the weather.
Emergency services alerting.
Other aerodrome information as requested by pilots which could include runway surface conditions and availability of fuel services.
Nup, nothing about sterile airspace...you thinking of changing UNICOM to a defacto primary control zone?
EDIT-wonder if anyone else noticed the same guy posting under two different names