Vesper External WiFi Antenna f/Cortex M1 
External WiFi Antenna for Cortex M1
Replacement WiFi antenna for the Cortex V1 & M1. Increase the WiFi range from the M1 (Cortex hub) by installing the external WiFi antenna. The external WiFi antenna comes included with the Cortex M1 or V1. Additionally the WiFi range can be extended with most third party 2.4GHz, 802.11b/g/n WiFi booster.