05apr11 THIS IS ONLY AN EXAMPLE OF HOW YOU CAN IMPLEMENT A DYNAMIC ULTRASOUND COMMUNICATION SYSTEM, EASILY. Hyperspike ultrasound infrasound dynamic network from here to however much you want to pay. Specs:"The Hyperspike Technology that has been successfully launched into the Acoustic Hailing Device (AHD) market is now available in the Mass Notification Market. The Ultra Hyperspike Mass Notification Systems are scalable, just like the AHD's, to provide the right solution to each application. Ultra USSI has three Mass Notification Systems in their product line, this is the 3 mile(4.8 kilomet) omni directional: * MA-3 - 12K Watts, 360 deg coverage, > 3 mile range / all directions omni directional The ultra wide frequency response and high output volume allow these products to project full, natural sound voice and attention getting alert signals to listeners in a full 360 degree omni directional pattern. 160 kilomet = 100 miles miles..33 units will almost get you to bangkok, just put em up on the big lights that are now in vogue. Why do this? Many advantages, for example: So they can listen and look at your ass whereever you go..not to mention the UAV DRONEs..and secret stuff that laws haven't been written for yet. MA-1 Product Sheet PDF : http://www.ultra-hyperspike.com/ProdSpec/Ultra_Hyperspike_MA-2.pdf ....OR... http://www.google.com/url?sa=t&source=web&cd=4&ved=0CCsQFjAD&url=http%3A%2F%2Fwww.ultra-hyperspike.com%2FProdSpec%2FUltra_Hyperspike_MA-2.pdf&ei=eqeaTYSBCdCIrAfRvZjoBg&usg=AFQjCNHU8Kqll9mJ8ES5-kg3uF_DGyO8ew&sig2=obQjlLO13uwaxLcJzZNTUA