I have an Ardupilot drone with a 5.8GHz video transmitter - xf5804 which sends video to goggles. Furthermore I have Jumper T18 radio transmitter and Jumper R900 receiver. I would like to be able to control the drone and get the video while being inside a building. Are there some antenna enhancers (or whatever) that I can mount on the roof and connect to my goggles/radio transmitter to achieve this?
As long as your googles and transmitter have external connectors you can use antenna cable to connect your VRx and RCTx to externally mounted antennae.