You are getting close to doing it correctly. What is needed is a Live and Active Radar Plot not a picture of the radar plot. Check out what the other question askers have done and post a radar plot like they have done. And as far as digiwave goes , no one here will recommend any of the cheap china antennas that are sub standard in every way. . Read what
http://www.saveandreplay.com has to say about clone antennas.