Given last spring's lawn spraying experience, I decided this year I wanted a sprayer that was mounted on my mower, not on a trailer, and a sprayer that had spray nozzles much closer to the ground. I rehabilitated an old sprayer I had retired from spraying our row of pine trees before they got too tall and before I found that bug zappers did a better job of protecting the trees from pine tip moths. I'd already set up this sprayer to ride on a hitch cargo carrier. An Internet search led me to a cheap four nozzle spray boom that I purchased from Amazon.com. I replaced all the hoses and the input check valve. Once everything was assembled, I experimented with nozzle height. I quickly concluded that the 80 degree spray tips that came with the boom were inadequate at the height I wanted, but these were easily replaced with four 140 degree deflector type tips from Atwoods. Here's a photo of my lawn spray rig and the resultant spray pattern.
Note the nice even six foot plus spray pattern. Also note that while I was at it I mounted two hose quick disconnects to make assembly easier and to allow me to quickly add a spot sprayer to the rig.