I bought 2 cheap 433Mhz receiver modules from aliexpress for comparison. One named RBX6 :
and one noname set:
This is my test setup – wire antena and 3xAAA cells supplying 4.5V power:
and these are their output waveforms on scope (the blue one is RBX6):
- noise with some signal starting at the end:
- random signal from outside
- my remote 5 cm from receivers
Make a conclusion on your own.