Love using a red hawk call downloaded from YouTube on my phone. The ground squirrels quit periscoping and stand up for you to see them. I don't over use it- they catch on if you do so.
I use Onyx to determine property lines ,ownership and pre scout new areas.
I've learned that in California, much of the uncorporated properties are in Trusts or in people's grandparents names. Consider making friends ((LinkedIn, church groups, business associates, feed stores) via others who may know the true owners & give the handoff for a warm introduction . Onyx helps me learn where to keep my eyes open when meeting people.