Wireless repeaters for data

I was wondering if anyone can suggest a company besides http://www.cellantenna.com for in Building wireless repeaters.
At the fire Dept. we are setting up the fire engines & Trucks with Laptops & are using Verizon for wireless networking via wireless cards.
At 1 of the firehouse's once the doors close they loose the reception from the towers & it's causing a problem to keep them online all the time for fast access.
I was asked to find a solution & know these in building repeaters will work, just need to come up with more the 1 place to purchase it from, since it's a Govt. agency & we have to try at least 2.

 

Thank you for the links bobolito