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The washer and/or saw blade goes on the Underside of the roof mount. This way you will most likely destroy your antenna before pulling your mount through a flimsy roof and splitting the roof metal. After dropping the headliner and drilling a hole I would take a wire brush and/or sand paper to the underside or the roof. This gives your mount and backing plate good metal to metal contact.


Mag mounts are great for convenience and the flexibility of swapping out between vehicles BUT if performance is what you're after the permanent mount is the way to go.