I have been in the 2-way radio business for many years, and I hold a degree in Electronics and Telecommunications.  Antenna theory was my major area of study, and has been my hobby for over 25  years.  I have also built and tested many antennas for unique applications.
My business is designing and installing 2-way radio systems for government agencies, law enforcement & public safety organizations, as well as commercial fleets.  Part of my work is to outfit emergency response vehicles with radios, antennas, and emergency equipment.  So I have literally installed hundreds of antennas, of all kinds, on virtually every type of vehicle. This has provided  me with the opportunity to evaluate new antennas that appear on the market, and compare their performance and durability with proven products.   I also hold an Amateur Radio license (N7UTB).