Repairing an old Rooftop Antenna

[Electronic M]

The 300 to 75 ohm outdoor baluns are still made and obtainable. IIRC they're available on Amazon.

The antenna is still usable if the rods are all still present and either not bent or able to be straightened, the insulators aren't ruined and or conductive, and you verify and or fix any issues with the jumpers between rods getting corroded and not having good continuity at connection points to the rods and balun.

You can't really stop lightening from going places...You can install a lightening arrestor for TV antennas to encourage it to take a different path to ground than your TV ant, but that still doesn't guarantee anything. I know people who install outdoor TV antennas in their attics to prevent lightening, and antenna damage.
Rotors are still made....IIRC they're more of a ham radio thing, but you should be able to get a new rotor and control box. Some of the old control boxes were proprietary to their rotors so don't use a mismatched set without doing research.