Topband: lightning grounds for elevated radial antennas

[Grant Saviers]

A lengthy thread re grounding on towertalk prompts me to have concerns 
about protection of my T top (85' to top plus two 33' top wires) wire 
160m vertical with eight 125' elevated radials.  Since that covers more 
than an acre (it's mostly among 100' tall conifers) it has a lot of 
target area, radial routing close to trees, and high ground 
capacitance.  I did DC ground the vertical via a 3 core 240-31 choke, 
about 5k ohms to a single ground rod but that was for static protection 
of radio front ends.  The antenna is fed via a 50:25 ohm TLT so the 
radials have a DC connection to the choke.

What is best practice for lightning protection of elevated radial 
verticals?

Grant KZ1W