Provides up to 40,000 sq ft of coverage and expandable to 80,000 sq ft. This SURE CALL 80dB Kit is a high professional system with unique features that allow you to reduce the power in both receive or transmit ranges if any oscillation occurs. This dual-band 68dB (800/1900) system uses Cellphone-Mates' large dual-band building amplifier. The complete system has been designed to broadcast an improved cell signal into multiple rooms in homes and buildings. Broadcast distance varies depending upon outside cell signal strength and frequency. Interior and exterior antennas should be separated a minimum 80+ feet to avoid oscillation between antennas. This system requires installation. There are 5 major components in this 80dB dual-band platform: 1. CM2020-80 dual-band amplifier 2. Inside Antenna (ceiling dome or wall panel) 3. Outside Antenna (Omni-directional or directional) 4. Coax from amplifier to outside antenna 5. Coax from amplifier to inside antenna 6. J-Pipe Universal Antenna Mount Sample installation: Antenna on the roof, amplifier and dome antenna in the attic. Outside antenna needs to be mounted on the roof of your building. Outside antennas are designed to be mounted on a pole (max 2" diameter) using U-bolts. Coax needs to be run from the outside antenna to the amplifier. The amplifier can easily be mounted on a wall in an equipment, utility, or storage room. The inside antenna needs to be mounted on a ceiling (dome) or wall (panel). Coax needs to be run from the inside antenna to the amplifier. Standard wall plug power is required near the amplifier. Antennas do not require power. Coverage Area Inside coverage distance varies depending upon outside signal strength, carrier frequency (800 or 1900Mhz) and interior obstacles. The CM80 has been designed to provide approximately up to 5000 sf of coverage in low signal areas (1 bar outside) and up to 40,000 sf in strong signal areas (4-5 bars outside). Note: These calculations are for 1900Mhz. 800MHz will provide more coverage. You may need additional inside antennas (at optional cost) to get these figures of coverage in your area. Please consult with Talktyme to determine expected coverage area for your situation. Antenna Separation Exterior and interior antennas need to have the proper separation. This is usually about 60+ feet depending upon several variables. * Obstacles (metal, concrete, etc.) between antennas * Difference in height between antennas. Vertical separation is very effective.