.. Green Doctor I have a question about how you keep the boom at the same height as you walk across a half acre or more?? I have a very similar set up but attached to a Walker Lawn Mower. BTW FYI the boom pictured is called a wet boom because the Support structure is also the tubing that carries the Spray solution to the nozzles which are directly attached to the boom structure. Dry Booms will have hoses attached to the support structure for transporting the spray solution to the nozzles which are attached to mounting braces that attached to the Boom structure. ..