Those are what I use on my planes, straight from RMRC. You could build your own for a lot less $, but without the equipment necessary to test the antenna you'll never know if you built it correctly. Definitely grab a set of the monopoles, and get rid of the stock antenna on your uhf tx. Mine was horrible, failsafes at 1.5 miles. A Diamond or Nagoya work very well, you'll see a nice improvement there. Throw that whip in the bin and grab a RHCP cloverleaf for the tail, RHCP helical for your ground station, and say goodbye to most video issues. Your patch is linear, no?