Long Range Wireless Coverage, Increase the Strength of Dual-Band Wi-Fi Devices up to 350% The HD9DP Hi-Gain Dual-Band 9dBi Directional Antenna Kit is an antenna for extending the range of your 802.11 a/b/g/n Wi-Fi devices. The HD9DP increases the wireless strength from a standard 2dBi (decibels) to a staggering 9dBi, resulting in up to 350% increase in the wireless coverage and strength.DUAL-POLARIZATION MIMO, A SMART ANTENNA TECHNOLOGY, IMPROVES THE WIRELESS CONNECTION BETWEEN YOUR WIFI DEVICESUnlike most standard Wi-Fi antennas that use the same pathway to transmit and receive data, the HD9DP is built with two antennas to create multiple paths for your wireless communication. This means better range and signal quality for wireless networks.