"Looking at the specs, it just seems to be the main board, from a 2w wifi amp, shrink wrapped, with the large, stock heatsink removed.

See here:
http://www.ebay.com/itm/2-4Ghz-Indoor-2W-33dBm-WiFi-Wireless-802-11...

Same price, nearly same specs.…"

"You could build one, but buying one is cheaper than the parts, for 2.4ghz ants.
There are plenty of free online calculators, for determining element lengths.
Also, Alex Greve (aka IBCrazy) on RC Groups forums, has posted tons of info on building…"

"What frequency are you using? This thread was about 2.4ghz boosters and antennae. I am a licensed HAM and have a lot of experience with antenna building and using linear amps."

"I've gone 5 miles without a booster, while still getting the telemetry signal back from the RX.
For short range flights (less than 5 miles), a mag mount 6db antenna, works fine.
On my boosted rig, I've upgraded to a high quality 500 mw Hyperlink…"

"Comment by William Wegenast
"So do you then run a cable from the Tx to the boost so you can still operate easily?
How long did you know your antenna had to be? Or is it the same the length as the antenna on the radio?"

Yes, I didn't show a pic of…"

"I got this booster on ebay, a couple years ago. Seems to be the exact same model sold on DIY-D.

"Comment by William Wegenast
@Flyin High In AC
Nice description!!
This is great! Care to share a link where you got your booster?""

"For those asking in earlier posts, these 1 watt amps work great with my Hitec Aurora 9. I got a good quality, USA made miltary grade UFL to RP-SMA cable. WAY better quality than those Chinese ones with the tiny, fragile micro-coax. I drilled a hole…"