Rosewill RNX-A2-EX 2.4GHz 2dBi x3 WiFi Antenna Extender $7 at Newegg

Newegg has the Rosewill RNX-A2-EX 2.4 GHz Indoor Omni-Directional (2 dBi x3) Wi-Fi Antenna Extender for $10 - $3 off with coupon code EMCJNHG37 [Exp 10/26] = $7 with free shipping. Features 2.4~2.5GHz with support for 802.11b/g/n, 2.0 dBi @2.4 GHz maximum gain, reverse SMA Plug connector, and is compatible with all 2x3 and 3x3 wireless adapters and routers.