My truck has a single antenna. I know it's probably not as good as duals. Mine doesn't have a spring mount, it's about 3' I'm guessing? My son drives truck over the road. I've talked to him from about 1-2 miles away, truck to truck.
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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