Nick,
Sorry, I did not even notice you are also from Maryland. There is not a specific limit on the number of signs or spacing between them. You can use blue paint to mark trees which tells hunters there is no hunting or tresspassing. In my opinion spend the few bucks and buy the signs, trust me on this one.
The following below is a cut and paste from page 20, lower left hand corner of the Maryland DNR hunters guide.
Controlling Hunter Use of Private Property
Posting property boundaries in a conspicuous manner makes it
illegal to trespass or for any person to enter without the landowner’s
permission. Maryland law allows the use of blue paint stripes, as well
as signs, to indicate private property boundaries. Vertical paint marks
at least 2 inches in width and 8 inches in length must be centered
at least 3 feet, but no more than 6 feet, from the ground or water
surface. The paint must be oil-based and bright blue.
Goodluck,
Dave
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