Video transmitters (VTx) are vital to your FPV experience. Cheap ones typically give poor signal & bleed over other channels. A good one, from a known brand, will give you (and your flying buddies!) a much better experience.
A VTX has 2 important specs: The channels it supports and its output power. Look for 40 channels (which will include Raceband - the standard set of channels in use today). An output rating of 25mW is used at most races, 200mW gives you more range & if you really want to get out there, or fly behind trees & other obstacles while you’re freestyling a 600mW or even 800mW VTx is the way to go. Lucky you don’t need to choose one or the other these days - the majority of VTxs we stock can switch between power outputs.
A great feature to have is SmartAudio. It allows changing of VTx settings via OSD or radio instead of fumbling with tiny buttons.