So here is a very low tech question, no electronics or firmware updates required. We are considering the option to place remote solar powered nodes in a variety of out of the way, high elevation locations. As part of that we would like to employ 'security through obscurity' by, as much as possible, not calling any attention to the installation. Hence the desire to 'camoflage' the antennas which would likely be the most visible part. The antenna could be on a pole or attached to the trunk of a tree. I would assume any paint which does not have a metallic content would be transparent