HomelessBox: It seems like wifi-radar is looking for the wrong network interface. In this case, it's looking to use "eth0", when in fact it should probably be using either "eth1", "wlan0", or something similar. Type "iwconfig", to find out which interface is your actual wireless interface (the one that will have some sort of information next to it). Once you have the correct interface name, you will have to edit /etc/wifi-radar.conf:
sudo gedit /etc/wifi-radar.conf
Find the line that says "interface =" (it will probably have "eth0" after it right now. Just replace the current interface listed there with your actual wireless interface.
Hope that works!