What I Have Tried:

433mhz Modules from China, they turned out to be faulty and replacing them would take too long or be too expensive to buy locally.

Hacking 315mhz Remote Module, the transfer rate was too slow ( 1bit per second)

Data over homemade FM radio transmitter including designing my own inductor that took a while. converting the data to sound, the quality of the signal wasn’t good enough to get all the data (data loss too high).

Radio Circuit I built ages ago, too large

As a last resort, I turned to trusty IR and am now designing a protocol based on Sonys IR protocol to send the sensor data. the main downside to this is the range and it needs line of sight.