Ever since I got my train horn set(s) I've wanted to get 4 of the seven trumpets onto the roof. I had all kinds of ideas to do it on the old rack but they were all a PITA. Now with the new rack I can finally make it happen. I'll leave three under the rig and put the loudest four on top of the rig. It will make a Very nice surround sound effect with the horns. I made a plate and rigged it so the retractable antenna lays down between the center to trumpets.