Prop-To-Prop Wireless Link for $17 NOTICE:  After spending several hours with this, I wasn't able to get it to work reliable at a range >1 ft!!!!  I don't know what the issue is...

This is the cheapest wireless link I could find...  Problem is that it only works with 5 Volts (despite what the walkthrough says) and the receiver output is very weak.  Took a while to get it working with the Prop, but here's how I got Prop-2-Prop wireless comms going: Transmitter:   Note:  I used pull-up to 5V and set mode bit 3 in "FullDuplexSerial". Receiver: