This is a little off topic of hanging signs on ones property, but back in the 60s I use to have a garden on my next door farmers land (with his permission) and at that time in MA one only had to be using said land for 7 consecutive years . I would have to go without planting for the year 6 into the 7th so I wouldn't be using his land for the 7 years in a roll as that was the rule. If you used it at least 7 years in a row and you have proof that you did, you could take that property without anyone saying a word. Now what type of a person would do that to and individual that had let you use it for nothing over the years???
