I did the shop vac at the opening. When it seemed like I got most, I opened up the siding under my porch roof. Found a nest the size of 1.5 basketballs....with a tone of yellow jackets still in it. Good thing I had a bug suit and leathers(bike gear does double duty)....a few stingers were found in my gloves after. Bagged the nest in a clear garbage bag. Lots of larve and eggs in the middle like a bee hive. Very cool construction on the outer shell though.
That's what I'm afraid of. That I don't get to the nest.