I did on my 376
Yep,Done in a big hurry the day before holiday cruise.Used 1" od SS tube bent to fit either side of stern entry.Made alloy plate for scanner and held in place with SS saddle brackets.Attached it to verticals of pushpit using Jubilee clips and mounted JRC 12" diameter scanner on top plate.Meant it to be a temporary fix - but that was 4 years ago.Interestingly the tube flexes but this cushions the shocks of wave motion.See 3 pics in photo forum titled Home Made Radar Arch - Pics are Scanner 1,2,3.