E-34 mast height
Based on the rig layout drawing in owner's manual on this site I found the mast height to be 44' 4" above the coach top and that the mast is buried 6' 8" below the coach top. Therefore it is 51' mast. I scaled the drawing and found the mast goes 15" below the water line. Allowing inaccuracies, I am confident the mast is less than 50' above the water, not counting the anchor light, antennas, etc.
BTW, most people don't refer to the '80s vintage E-34 with any suffix. The previous models were E-34T and E-34R.