Most people have the wrong idea of what trespassing entails. As a cable tech I enter back yards all the time without the homeowner's direct consent. The reason this is not trespassing is I have a legitimate reason to enter that yard and my company has easement access rights granted to us by the cities and counties that our service is active in. When someone purchases a house there is a section that spells out what easements are on the property and states that those services that are in the easement have the right to get to the easement even if they have to cross the property to do so.
Yep, one of you boys got confronted with a firearm after I found one kicking at my dogs who were going crazy in the back yard.