I can easily see your clearance issues.
Wanted to point out though.
You placed this on the CENTER of the roof, so that usually means Omni direction radiator and pickup pattern.
Signals from all Directions.
But, for DIRECTIONAL effects, the antenna needs to have more of the counterpoise, ground image - ahead of - in the direction of the signal you send (in that direction).
You get a larger lobe of signal in both radiation and capture (pickup) when the antenna works a longer ground plane.
The only reason I mention this is the TYPE of antenna you using - a skip shooter, works for a wide range of mounts and mounting locations - but many use it for the Directionality it has.
The effort of Base or Center load on a similar location - your Omni-directional pattern performance problem - is correct in observation.
It is when you relocate the antenna (Base and or Center load) to the edges of such a vehicle (any type of vehicle) does the directionality issues come into play and tend to make edge locations (to the rear forms pattern towards frontal exposure as an example) their performance more equal between the TYPES of antennas used with Top-Load onto the straight whip being the better to best choice - so your problem with location of the Mount tends to favor antennas that can handle the center mounting location and provide some of the best results to your liking.
So you're set up for Omni - I grant you that But to ask for more - you'll need to use the longer antennas to obtain the signal results - so the choice is yours to make.
Wanted to point out though.
You placed this on the CENTER of the roof, so that usually means Omni direction radiator and pickup pattern.
Signals from all Directions.
But, for DIRECTIONAL effects, the antenna needs to have more of the counterpoise, ground image - ahead of - in the direction of the signal you send (in that direction).
You get a larger lobe of signal in both radiation and capture (pickup) when the antenna works a longer ground plane.
The only reason I mention this is the TYPE of antenna you using - a skip shooter, works for a wide range of mounts and mounting locations - but many use it for the Directionality it has.
The effort of Base or Center load on a similar location - your Omni-directional pattern performance problem - is correct in observation.
It is when you relocate the antenna (Base and or Center load) to the edges of such a vehicle (any type of vehicle) does the directionality issues come into play and tend to make edge locations (to the rear forms pattern towards frontal exposure as an example) their performance more equal between the TYPES of antennas used with Top-Load onto the straight whip being the better to best choice - so your problem with location of the Mount tends to favor antennas that can handle the center mounting location and provide some of the best results to your liking.
The experience I speak from comes from using mag mount antennas with a FIXED antenna mounted to the edge of a vehicle - for fox hunts - you initiate the contacts with the mag mount arranged to give a Omni-directional pattern for the start of the "Hunt" - you can then use the Fixed antenna as a means to throw off the scent by changing the pattern of radiation to a longer directional pattern radiating the signal thru the interference pattern of the Mag mount using the FIXED antenna.
You don't move the vehicle, you move the antenna(s) (Yes plural) for the changes in mounting locations of the Mag-Mount and The Fixed position antenna - you can't change the Fixed, but you can change the Mag mount location and how it couples using the fixed antenna. It can generate a "Beam" or interference pattern you can make a awkward patterns for others that are trying to find the "Fox" - you generate a directional pattern using a combination of both antennas to act parasitic to each other.
You don't move the vehicle, you move the antenna(s) (Yes plural) for the changes in mounting locations of the Mag-Mount and The Fixed position antenna - you can't change the Fixed, but you can change the Mag mount location and how it couples using the fixed antenna. It can generate a "Beam" or interference pattern you can make a awkward patterns for others that are trying to find the "Fox" - you generate a directional pattern using a combination of both antennas to act parasitic to each other.
So you're set up for Omni - I grant you that But to ask for more - you'll need to use the longer antennas to obtain the signal results - so the choice is yours to make.
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