I live in an area with frequent lightning strikes. Occasionally people get killed due to those - specially when strikes enter house through TV antenna cables. My house is quite tall and seems to be the tallest building in this area. I have one lightning protector installed already. I wish to install some TV and satellite antennas on the roof of the house but very worried about possibility of lightning strikes entering the house through these cables. I am currently thinking about passing each cable through a two pole isolator switch which would allow me to switch off the isolator when lightning occur. Does this sound like a good option? Or are there better options available?
Make sure the antenna pole is grounded. Disconnect the antenna plug during thunderstorms, and all should be fine. You cannot of course prevent damage from a direct hit. I would also recommend physically unplugging (not just switching off) expensive electronics, both from power line and telephone line (e.g. DSL modems). Lightning arcs will easily jump over at least two switched off mains switches (in series).
Most lightning surge protection systems exist to suppress surges when lightnings strike some distance away (many hundred meters away). If there is a direct strike on your building, it will probably end up with a hole in the roof and a broken water tank. This is what building lightning arrestors protect against. A grounded antenna pole might do this job.