Hello,
I have start to make a solution with two Arduinos.
The first have sensors (DHT11, SoilMoisture..) and a CC1101 to transmit data.
The second Arduino essentially have a screen to display the data and a C1101 to receive the data.
The CC1101 that i use is here : http://www.miniinthebox.com/new-433mhz-wireless-rf-transceiver-module-cc1101-with-antenna_p381479.html.
Specifications explains that the open transmission distances up to 300 meters.
I have correctly setup the module and use the CC1101 library which is here : Google Code Archive - Long-term storage for Google Code Project Hosting.
My problem is that my solution works... but only when the transmitter and the receiver are at 0,5 meters 
...
I need to increase this range but i don't know how to do it.
Can anyone help me ?
Thank you for your help,
Julien