... Antenna : 1. 250-300 square meters suitable ;2. Gain: 3 dbi ;3. Suitable for 800-2500mhz ( CDMA,GSM,PCS,DCS,2.4G ... or semi-underground place of business, basements, underground parking, etc.;B, Complaints from small-scale hot-signal areas, such as conference ... fitness clubs, leisure and entertainment, etc.;D, Elevator, lift wells in particular, not in the lift cables laid;E, Home, office, luxury yachts ...