xpr 3300e

Hi I'm having trouble transmitting my XPR3550e while I'm in my house with skylights and heavy steel beams any ideas?

AAH02RDC9VA1AN Battery is rated at 94%. No charger included; get one off of Amazon cheap. Programmed to be on the Frontier Airlines system at DEN. This item was legally acquired from a government entity and you will receive a bill of sale. Unknown password status. Payment accepted via personal...