my house is a gun free zone. i just don't have the sign
Sorry, it doesn't work that way. You have to have the sign, the same as all the schools and other vulnerable places. What's good for them is good for you. You have to announce to the criminals that you have no guns.
Otherwise, you're just freeloading on the deterrent threat of others owning guns in their homes. That's what I do, except that I'm not a hypocrite on GFZs.
Get those signs up!