For the LaForge you are definitely best to go with an omni and a directional. I personally use a TBS Triumph and a VAS Crosshair. Cheaper options exist, but the nice thing about goggles is they don't crash Goggles are definitely the most expensive part of the equation, especially HDO's.. Quality antennas make a huge difference, so I wouldn't recommend going cheap there.
No. I’m trying to fly FPV. I’m not sure what you’re talking about when you say “the aerial on the goggles must be attached.”Are you trying to play a saved video from the phone through the u?
The aerial on the goggles must be attached and make sure they are set to show the HDMI input if they have that setting.