u/Left-Transfer-6765

I'm putting up a hexbeam on top of a 20' aluminum pop-up mast (Rohn H20). A Yaesu rotor will sit at the top, and the hexbeam will attach to a 6' piece of aluminum protruding from the top of the rotor. The mast will be about 50' from the house, and will have its own copper ground rod installed at the base.

Ultimately, I'm trying to carefully size out the LMR-400 coax jumpers I need for this. My understanding, based on my own research and also reading DXE's Lightning Protection whitepaper, is that I should expect the following coax sections:

1. From hexbeam to mast bonding point just below the rotor: using a DXE-GCB-150 to keep it easy
2. From GCB-150 to another GCB-150 at the bottom of the mast*
3. From the GCB-150 at the bottom of the mast to a nearby Polyphaser mounted in DXE's enclosure kit, which itself is mounted against a 4"x4" wooden post used to support the mast
4. From the Polyphaser, into trenched PVC conduit, and out into the same enclosure kit acting as the house entry panel - connecting to a second Polyphaser
5. From the Polyphaser in the entry panel, into the house, to the back of the rig

Questions:

1. *Do I really need coax jumper #2 above? DXE says to bond at top and bottom of tower if < 75' high, but trying to understand what I'm getting out of this when only at a max height of 26'.
2. Polyphasers on both ends of the PVC trench - yay or nay? They're not cheap, but dropping to ground at the tower is always better than dropping it outside the house... would appreciate thoughts here if this is overkill or sound practice.
3. The mast is 50' from the house, all in sandy soil - does trenching a thick ground wire between the house and mast ground help in this case, or is this too far to be worth it? Does anything change above in terms of coax interconnects above?

Thanks in advance for any insights, and can clarify or answer any questions as needed.