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I recommend the 4560 eave mount , the bottom mast mount bar can be extended out further and this allows more distance between the top clamp and the long bottom bar and clamp.

The standard outside diameter of Tv antenna masts is 1 1/4 inch.

The mast clamps of the eave mount will not be smaller then 1 1/4 because then the standard Tv antenna must would not fit in.

It is Ok to have mast clamps larger then 1 1/4 because then 1 1/4 masts and larger will fit.

The eave mount is -> a eave mount.

The J mount has more flexibility because of the one foot mounting.

The ANT751 is a very light weight antenna , the J mount that comes with the antenna will more then hold the antenna.

So really it is all your choice now.