Hello Toronto...
Nice location...hate to be overly observant....but those steel supporting clamps supporting the DP antenna, are mounted incorrectly...the DP instructions are that metal clamps are only permitted within the bottom 7 inches of the antenna, and as well, the metal supporting tube, should be within that 7 inch limits as well...otherwise, the antenna pattern, and impedance matching will be off, resulting in lower gain.....I recently burned the front end of my AirNav receiver, so recommend an antistatic/lightening inline protection device be installed....FYI Doug/VE6LFL