[TowerTalk] spacing between HF beams

[Donald Hofmann]

Hi I decided on a US Tower TX-455 for my tower. I am planning on installing a Hygain EXP-14 (or TH3MK4) and A3WS 12/17M beams. What is good spacing between the bottom beam and the tower top and between the beams? The mast will extend 4' down into the tower to the Ham IV rotor and I am wondering how much mast I need above the tower? Which beam would you put on top? 
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