It makes sense to mount the antenna there; the mounts looks like there should be some sort of option that can be mounted on them.
I see what you mean; using the bags mount would set the lights far enough in between the bags and the fender that you would only see them if you were looking directly behind the bike.
Retired USAF, IYAAYAS!
2008 V-Star 1100 Custom Bobber project
2011 Crimson XR with Forged Highway Bars / Hard Bags / Passenger Backrest, Ness parts including Smooth Layback Plate Frame/Mount / Rad 3 Mirror / deep cut grips / drivers floorboards /shifter peg / brake peg / passenger pegs. Witchdoctor black rack, Lloydz filter / timing wheel / VFC III, 7Jurock windshield, Drag Specialties seat.