Just received this helical antenna from hobbyking. It is a an awesome antenna for the price, $14 bucks only. Built quality is impressive when compare to the other Chinese made ones on eBay. Best of all, it actually performs. Before this antenna, I am using a fatshark spironet on the p2, with spironet patch and spironet on my black pearl. I am getting ok video feed up to about 500m, then it started to have lines and interference. I tested this helical antenna with the patch on the black pearl yesterday, my video feed is crystal clear up to 1000m, then my radio lost signal. I just ordered a blue beam ultra for the p2, I will keep you guys posted for the result when it is in. Seems like fatshark spironet is not that great after all (even when using it in short distance), they seems to create a weird interference with the black pearl and causing video break up.
http://www.hobbyking.com/hobbyking/...Turn_5_8GHz_Helical_Antenna_RHCP_SMA_RP_.html
http://www.hobbyking.com/hobbyking/...Turn_5_8GHz_Helical_Antenna_RHCP_SMA_RP_.html