Thanks to my cousin W7TAO for the lending of the tennis ball line launcher! I made some videos and took some photo's. The first day of using the launcher, I picked a cedar tree that was surround by a bunch of maples. I launched that ball quite a few times, but just couldn't get it to do what I wanted,
The cedar I was shooting for is in between the gravel pile and the white suburban in the photo. The tree I eventually used is the maple above the yellow slide seen beside.