The antenna has rubber on the outer casing. The radio had very little metal comared to what would have surrounded him. The antenna was what at the most 6 inches high? How tall was the man. Now had he been holding a guy wire, metal pipe, or near a culvert then I can see the metal being a factor. If he had it hooked straight to his base tower instead of the rubber duck I can see a factor. Otherwise no.
Yes, but lightning doesn’t come from the sky and hit the ground. Lightning is the result of an accumulated charge which is released to the atmosphere. Lightning goes from the ‘ground’ up.
That is why there are lightning arrestors. They don’t actually arrest anything, they simply disperse the excess ground charge into the air slowly.
Lightning occurs between two points that have a negative excess of charge to an area that has a low positive charge.
Walking across dry grass in shoes can cause an accumulated charge.
And it’s a moot point , as the lightning stuck ‘near’ him, and not directly to him or the radio. The radio may or may not have had any effect on the incident. He’s alive, which is what is really important.