Grounding is certainly a technically good idea - for several reasons. How much it "prevents" lightning strikes is debatable, but the answer is "probably a little bit".
It's particularly helpful if the pole is attached to some other structure - like your house, etc.
But if the lightning does strike your well-grounded, very-conductive pole, it's still going to do damage - and will certainly "kill" the electronic components in the ISS.
One source says: "An average bolt of negative lightning carries an electric current of 30,000 amperes (30 kA), and transfers 15 coulombs of electric charge and 500 megajoules of energy. Large bolts of negative lightning can carry up to 120 kA and 350 coulombs."
500 megajoules is approximately 140 killowatt hours - or roughly the same energy as exploding 200 pounds of TNT.