I would think the simplest solution would be to use an antenna that doesn't require an RF ground (one that doesn't use ground/dirt as it's 'other half'). A safety ground (lightning) is a completely different 'animal'. If possible, it's a good idea to safety ground any antenna. And/or place a ground point device in the feed line before it enters your building.
Safety grounding is NOT a simple thingy. Usually, it also isn't cheap if it's done right. A 'spark-gap' type device is NOT a very good safety grounding device for antennas. It isn't fast enough and only 'grounds' one half of the antenna, usually.
- Paul