His antennas are no better then what you can buy off of ebay. They look nice and should for the ridiculous he charges. I had dealings with him in the past. Not a great experience and would never recommend him. 5.8 and 2.4 antennas are all over ebay. The cables and connectors are the same that they use on the 4Hawks antennas for the small DJI UAV's. Some guys are actually using the one for the spark already.
RaptorSR for DJI Mavic and Spark drone