"Damn, I'm losing faith in this Frsky stuff.  My mate and I both did range checks at the field and got between 40 and 50 paces.
In the air we both get the odd RSSI warning (set to 45) within 150m!
I read through the rcgroups "what's your frsky…"

"Brilliant, thanks for the info. I'm all set to do some more testing this afternoon before I dive in and purchase the antenna bits. I'm only racing my quad up to 150m away, so I'm expecting to have success with the stock antenna, otherwise something…"

"Alasdair,

I couldn't source SMA connectors and antennas,but I have found SMA-RP. Do these look like the right thing to get?
http://www.banggood.com/10cm-PCI-UFL-IPX-to-RPSMA-Female-Jack-Pigta..."

"Thanks Alasdair.
I've been considering fitting a connector for a 5dB antenna. I'll take a look on ebay to spy the bits.
I think one antenna up and one down, with the TX antenna up would probably work best for my FPV quad.
I'll experiment some more…"

"I noticed, when grabbing an antenna during testing, the RSSI dropped quite a bit. I thought the other antenna was faulty, but after a while the RSSI came back up again so it must have switched to the other antenna.
How do I position both antennas…"

"Well, after mounting the X4R back in the quad with the antennas in the usual position it actually failed the range test again.   Re-orienting the antennas then passes easily (40 paces, 50 RSSI).
So I'll have to take back my test results I'm afraid.…"

"I have joined this forum just to thank Alasdair. I stumbled across this thread doing a general google for range issues.  
Anyway, my X6R in a heli and my X4R in a quad started failing their range check out of the blue - only getting about 20 paces…"