@CritterKeeper
I agree. However, let me say at the outset that we live in the woods, so I don't expect much.
In all honesty, when we used them, I couldn't tell any difference in the mosquito population. After a couple of seasons, I took them down and they are one step away from the trash. I thought about trying to give them away, but it's just too much trouble.
For the last two years, I have had a service come spray once a month and that's the only thing that works.
Maybe if you have a small, unwooded yard, they are great, but for us = waste of $$.