Indeed the thing attached to the spigot is a siphon break. Usually there is a allen screw someplace that holds it in place and resists unscrewing it. I would look all around it for that screw and, if necessary, look at your other one or a neighbor's. They come off. However, to fix the faucet, you do not need to remove this thing. It can only leak if the faucet is leaking.
It appears to be leaking because the faucet is leaking. Turn your water main off first. Then remove the handle, then I would take a wrench and remove the valve stem. It is the nut shaped thing just under the handle. I suspect that your washer is bad and leaking. If it is not the washer, then you might see that the seat of the washer/ valve stem is cracked by looking down into it with a flashlight.
Take the washer and valve stem to Lowes, Home Depot, or similar and get a new washer.
Outside faucets are abused by turning them off with too much torque. This usually causes the washer to wear and cause a leak.
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