I am using some "no-name" (in fact "XY-MK-5V" stands on the board) 433 MHz receiver (and transmitter) on an Arduino project. I can receive the signals sent from my other Arduino very good (it sends with 12 V as mentioned in another question).
The problem is: I want to receive signals from other parts – such as simple power outlets wireless switches, too. When they are sitting next to my Arduino, everything is fine. When they are ~ 3-4 m away, the Arduino gets no signal (or more times doesn't get the right signal).
At that time I am using a simple ~17 cm long wire that is curly to save space soldered to the "antenna port".
What can I change in order to get a better signal?