The MiniWireless is a low cost wireless Arduino based on the ATMEGA328P microcontroller. This radio can communicate with and has been tested with the Moteinos 915MHz RFM69W and RFM69HW.
For a simple 1/4 wave monopole antenna, cut a length of wire 82mm long. A 1/2 wave monopole antenna is 164mm long.
MiniWireless Features: