If you are serious, then do some more research. From what you've said, you have NO evidence of gold under your house other than some tall tales. A metal detector of any sort will not help you, because it's too deep and it's under a house. There will be so much interference from pipes and wires and whatever else that it basically won't work at all. Plus, you've already said that if you dig anything up the army will come take it anyway. So why all the fuss? Spend the money you would have spent chasing the gold and pay your hospital bill instead.