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Looks to be the same size. Product description describes the HD as:
Extra Heavy Duty Stainless Steel Ratchet Mount. Same as Style 4187 with extra strength and rigidity. Use wherever its extra heavy-duty construction is needed.
I'd use this if mounting on a Tee Top or if mounting a extra heavy antenna such as a CellWave
Extra Heavy Duty Stainless Steel Ratchet Mount. Same as Style 4187 with extra strength and rigidity. Use wherever its extra heavy-duty construction is needed.
I'd use this if mounting on a Tee Top or if mounting a extra heavy antenna such as a CellWave
