for a while but I already had a "box type" with the antenna on top so didn't need another one. Boy, RDF's were a PITA to use. For those of you to young to remember these things, you would sit at the nav station with this thing in front of you looking for the "null" from some signal from a radio station or one on the end of a breakwater or light house. The null was when you got no sound or needle deflection because the radio was looking right down the signal and there was a dead spot. When you got the Null you would set the bezel to your compass heading and then strike a line from the signal origin to out past your DR position. Then you would do it all over again from another station. Then you would do it from yet another for a third and you would end up with a triangle. You would call that your "Cocked hat". Don't ask me why it was a cocked hat but it was and you were someplace in the middle. I had+ a ComNav RDF on my 18 foot HMS that I used to sail out around Catalina and Santa Barbara Island on the way to Santa Cruz. It also had a QME wind vane self steering unit I bought "mail order" out of the back of Sailing Magazine. RDF and a "flasher" (a depth sounder with a flashing light spinning around in a circle on the face of a meter) and you were really high tech back then. Fog was really fun. All you old guys remember this stuff. I'm sure you have some pretty fun stories. Let's heard some!