[GMONEY]

Just thought about this, had forgotten we had it at work. We utilize Nextel alot. They have signal problems as it is, but not to help matters any we have a tin roof over the building. So it is hard to get a signal in the office and strong consistent one anyway. We had them install a wireless antenna booster about 4 years ago. This is kind of what you are talking about.
There is a senser mounted in the panels of our ceiling tiles. It is alittle bit bigger than a Hockey Puck. It runs to a antenna on the out side of the bulding. But it does not work like they said. It was expensive and not something you would carry around.
The military might be using something they have that is similar. Also there are different type of signal boosters. try this link..

http://www.powerfulsignal.com/

http://www.accessorygeeks.com/uniantennas.html


Also you would want to check to make sure his Command would approve of something like that if you bought it. Basing on his location in the world, might be a security issue also. Just a thought..