You want the Dynaplate for your VHF and other normal grounding needs. These sintered plates have high internal surface area and are good for dissipating small currents. They are NOT good lightning grounds because they cannot dissipate high currents due to the high fields involved. The fields make the Dynaplate act like it has only its external surface area when trying to pass the thousands of amps from a lightning strike.
You could build in a lightning ground by fastening strips of Cu to your hull. Although I am probably the ultimate experimenter do it myselfer, even I thought this was absurd on my cruising boat due to the risk of the strip coming off.
So, the better solution to a lightning ground is to use a deployable one. My first was made from 2' x 2' copper flashing joined by soldering and bolting to a lug to #4 tinned Ancor battery cable with a big battery clamp on the boat end. The copper flashing has a 3/8" poly bridle attached so ti can be dropped overboard and tied to the boat.
When you see a T-storm approaching, you drop it overboard and clamp it to your mast. Unfortunately you cannot use it underway and it is a pain to stow. BTW, DO NOT use normal battery cable because it will corrode at once to green jelly as the salt water wicks all the way up the insulation.
My latest, shown in the attached pics is made from stainless steel cloth (actually nice stuff) with rigid stainless rods at top and bottom. It also has the #4 Ancor battery cable but has a large welding clamp on the boat end so you can twist it on the mast connection to get a good low resistance connection. Lower it overboard, make sure the cable has no significant bends and attach it to the mast up reasonably high. Attach the 3/8" poly line to a cleat, rail or similar so you don't lose all. Depth in the water does not matter much but it should all hang vertically. You see the stainless cloth has large surface area (4 sq ft) and lots of "edge".
It can also be used while underway if deployed from the stern with floats on the stainless rods and cable as shown. It can be towed at up to 10 kts.
On a sailboat, it is intended to be attached to ones mast and there is also an additional length of cable and connection to also attach to something else too, like your shrouds. BTW, I also disconnect my masthead VHF antenna at the base of the mast and short the antenna coax there with a shorting plug to make the antenna and mast at the same potential.This way, a strike thet hits the antenna goes thru the mast and not down the coax and into the cabin.
The bag it all stows in is made from silver coated ripstop nylon so you can put your VHF and other sensitive electronics in it to prevent EMP damage from a strike. During a storm, I put a GPS, the main 25 watt VHF and cell phones in the bag and use an old handheld GPS and 5 watt handheld VHF.
The attached pics were mde this past weekend in deployment and towing tests from my powerboat in N. Florida. This weekend, I intend to do deployment and towing tests from a Hunter 23.
Is it practical? I dunno yet but it does partially alleviate my deathly fear (justified) of lightning and allows me to use my inherent geekiness to make stuff.