I have a 433 Mhz garage remote control that works very well even from 30 to 50 meters and it has no antenna!
How is it possible that it works so well without an antenna?
Also, given the picture of the PCB, is it a "superregenerative" or a "superheterodyne" module? I was told the latter was better in terms of range.
PCB of the remote control:
Here with the case:
PS: As a comparison, I'm struggling since days with these transmitter and receiver modules based on FS1000A and even with 17.3cm long antennas, the range I get is really poor, only a few meters... (maybe I was just unlucky with this production batch):