Dan's notion is about risers that trigger the main blast. However, I'm of the opinion, that if you want to protect the aircraft you should let it's potential difference, p.d., relative to ground, float to where it wants to go. While fields are building up, the whole (bonded) aircraft will become nearer to the offending field's potential and therefore have less attractive force.
Here, we're only talking about spray which causes sparkling discharges. A main bolt is quite a different matter.*
Two problems: one is if Dan's assertions are correct then there would be less of a chance of a strike in the first place. I put the question on a physics forum but there has been almost no response so far.
The other problem with the aircraft's p.d. floating is that if some luckless soul had one foot on the last step of some airstairs, and one on perhaps damp ground, he'll get the most serious case of nut-illumination imaginable. So, for ground crew protection the aircraft must be grounded.
*The entire exercise is about light spray of fields. A serious bolt of lightning is physics at is most ferocious. The voltage sheer across the area outside the plasma core can be a million volts per inch. Any notion that being 'static electricity' will be helpful you can forget. The currents in that core are capable of boiling metal.
Mindful of history. Flying a kite with a wire string is not the wisest of ideas.
Back to the aircraft. The only way I see to truly protect a very high tail is to have a dedicated Cherry Picker stationed right by it with a specialised rod pointing skyward. It would have to be seriously well grounded. Trouble is, you'd need one for every aircraft, though perhaps protecting a high value A380 just might give an umbrella of protection for smaller ones nearby.
Thick copper conductors for masts and churches seem to work well for minor discharges, but I suspect it is the ridding of those pre-charges that does the magic. Lightning conductors can be vaporised.