no T-mobile coverage in my cube, or building?

I received a T-mobile Blackberry 8700g demo unit. turned it on in my cube. Surprise surprise, no coverage. walk out still no coverage. wandered around got no coverage. until a Blackberry scout told me to lean the unit against the north glass wall. That's pretty pathetic, consider that 1) the company is a T-mobile partner and this unit is one of the many demo units from T-mobile 2) the building is located less than 5 mile north of I-285 and I-75 intersection.