Hello,
I search many forums, info, sellers.. and found info for this kind of modules but for Arduino, and cannot find simular for raspberry pi.
do you know some, which is not so expensive and it is sender/receiver in one with good antena.
some examples:
https://www.amazon.de/dp/B01CI01F94?psc=1
http://www.dx.com/p/stc15f204-nrf905-wi ... 82-LNHSrnU