Vhf marine radios are a good option.
No offense, and others and I have said this before: please don't. Don't even think of using Marine, or Aviation, or military frequencies for prepping. I don't want to be all doom-and-gloom here, but that's a line that ordinary people can't cross.
Remember that Marine radios are used for
really serious stuff, like guiding Liquified Natural Gas tankers into port, or calling for help when the captain of a cruise ship realizes that his steering is frozen and he's going to hit a pier that was converted to condominiums (yes, it happened).
Aviation, for all the obvious reasons, has to have clear channels all the time, and
any radio using an aviation channel has a line-of-sight to every commercial airliner flying overhead.
Military is in a class by itself, but all three classes of use have separate frequencies because they are used for things like distress calls, weather warnings, and gunnery practice.
If you trample on some range safety officer's status report, cause a 747 to have to "go around" instead of landing, or annoy a Coast Guardsman who is worried about a sunday sailor cutting across the path of 5,000,000 cubic feet of LNG, you can expect a visit by very serious men who will, at best, confiscate your radio, and at worst, throw you in a cell.
You don't need that kind of grief. It won't do any good to claim that you're too far from the ocean or too far from an airport or that there aren't any military bases nearby: those channels are for saving lives, for real and in real time, and there are a lot of ordinary people who found out the hard way that it's not a joke when someone knocks on the door and shows a warrant and changes their life forever.
This forum is a nice place to talk about prepping, but all the talk in the world won't change what happens when you threaten a ship or 747 or artillery range.
Don't do it. Please.
William Warren