You are going to need more than a 4' grounding rod. You need quality 10' with 8' driven into the ground (4' rods will do little to nothing), not cheap grounding rods, one at the base of the antenna (3 is better), one at the outside at least 6' from the house ground going to the meter and then another right outside of the wall or window to the shack where the wire goes into the house.
There, attach a gas tube lightning arrestor and ground it. From there, run the coax through the wall to your shack.
Have a soild piece of copper, such as a square or rectangular stick of copper behind the equipment in the shack. Run a seperate ground to each piece of equipment in the shack that can be grounded to the copper rod and ground each piece of equipment to it.
Attach a heavy copper wire to the grounding behind of the equipment and run it outside to the ground wire the lightning arrester is connected to.
You must keep all runs of copper wire very short or you will have problems.
It makes it tough, I have to put my antenna in a spot I would not prefer to have it in, it will work well but because of the need to keep the ground runs short, I'm going to have to put my station in a spare room right behind the wall where the electric meter and ground is, not where I want it.
All grounds must be attached togather, no seperate runs to other ground rods except at the tower.
Grounding in not fun, not convienent, but must be done right if you want max protection. Do it wrong and have a house fire as a result of lightning hitting your antenna and your insurence will not cover the loss. Lot of people do it wrong. Too long a run of ground wire can hurt the amount of power going to your antenna, creat a ground loop, put RF on the equipment in the shack, the list goes on, the ground wire can act as an antenna.
Really study the ARRL books, they have the best material for grounding correctly, be safe, keep your home safe and get max range from your equipment, ground right and you'll have all of these things.
Good Luck, John
