I'm pretty sure this wouldn't work, but I've been asked by a customer about sending a HDMI signal to a remote monitor. He's suggested that using HDMI-to-ethernet converters and wi-fi extenders would do the job.

His idea:
laptop > HDMI-to-ethernet > wi-fi AP with extender > wi-fi receiver > ethernet-to-HDMI > monitor

My first idea:
laptop > HDMI-to-ethernet > cat5 cable> ethernet-to-HDMI > monitor

The issue with using a cable is the distance - it could exceed 100m, and that would need an amplifier/repeater - which is problematic for other reasons.

My second idea is to have the source laptop running as a streaming server, connected via point-to-point wi-fi to another laptop (or Raspberry Pi) running VLC, then output to a monitor.

The whole situation is a bit more complicated, but this part is where I need advice.