Any cell routers with external antennas?

Ok so I live in a city , surrounded by towers all within 2 miles.  I have as of yet to even get half of the lowest contractually promised download speed.  The excuse I was given by tech support was that it was traffic on the towers.  Of course I find it hard to believe that at 2AM tower traffic is so great that iit would cause my speed to be such that I cannot stream a 720p movie.  

If everyone no matter where you live with fairly close proximity to a tower is not getting the contractually promised speed, without having to add a external antenna which voids the warranty, then this should be turned over to a class action attorney so that we are all reimbursed for the failure to fulfill the terms of the contract.