I own the HD kit V2, but I think these things could be similar.
As mentioned, use other antennas, the cap of mine fell of while touching a wall with it (I was hovering 😂) inside my house. Also (I think that happens with every VTX but I made that mistake) if you plug in a battery for example to get a GPS fix and the VTX is powered, even if the goggles are disconnected it heats up and when you start flying, it somehow is in a low-power mode with a verrrrrry short range.