I came across this video transmitter which claims to have 300' (90m) range LOS and latency <2ms.
The TX which is like a dongle weighs at 2oz (56g). As i don't have expirience with HDMI devices i assume the TX is powered from the camera if HDMI slot can provide the 5v needed for it's operation.
I don't think this is suitable for the FPVer but it's definitely a good tool for the cinematographer who could use an HD live feed.
For a fast review try here
Replies
Here is a video of my HD FPV system + Telemetry with 15+ mile range:https://www.youtube.com/watch?v=RdHIohydwYE