The Bulldog PRO Series antenna is perfect for in-building applications. It is available with up to 4X4 MIMO LTE, 5G, CBRS, LTE LAA, and WiFi. It is inconspicuous and blends in with the ceiling of almost any room. This 2×2 foot antenna only hangs out about two inches from the ceiling. Mounting an antenna on the ceiling eliminates the problem of poor RF from metal obstructions in the closet.