If you are planning to build a digital billboard and are worried about some tree obstructions, it is better to deal with it before construction begins. Flag the height of your sign and see what obstructions need to be dealt with. Dealing with obstructions after the sign is built can sometimes become an unsolvable problem.
Issues related to public opinion
Nobody really cares about a person trimming trees or bushes within their vicinity. These things happen all the time. In fact, some companies hire groups of men just to cut and trim plants. So don’t be afraid of anyone pouncing on you if you try to cut or trim a bush that is obstructing your much awaited billboard. Nobody will say a thing because no one really cares.
However, if you wait until the billboard has been put up, everyone will have a problem with trimming an obstructing plant. That is because now people will actually notice it. They will know that a few days ago there was a big tree in front of this particular sign and now it’s gone. Immediately complaints will come in to the authorities accusing you of ruining the environment. To avoid unwanted troubles, take care of this matter before the sign comes up.
Issues related to permission
Keep in mind that getting permission for cutting or trimming a tree is also 100% easier to obtain before the sign comes up. One reason is because your neighbor may have a grudge against your guts to damage his property. The damage is more visible once the billboard has been installed so he may deny you the rights to trim. Another reason is that even though your neighbor doesn’t hate you, he would realize the powers he has on you and may want to blackmail you for money. Once the sign is constructed, he has the upper hand in everything and he may take advantage of that.