They spend a large amount of the time feeding on larger insects, like moths and beetles. Whipporwills and poor-wills are nighttime birds that do eat a tremendous number of mosquitos, eating more in one night than a purple martin does in a lifetime. Also, the entomolgy specialist discourages the use of pesticides in and around the home. It is unlikely the pesticide will reach where the mosquitoes live. Thus, it is a waste of time and money.
Mosquitoes fly anywhere from several hundered yards to several miles depending on the species.
Trying to spray such a large area is not feasible. A new mosquito-control product called Mosquito Dunks is effective, but only if used where mosquitoes are breeding. Mosquito Dunks look like small donuts. The Dunks, which float in water, contain bacteria that kill mosquito larvea and are effective in wet areas that cannot be drained. I do caution, please read all pesticide labels before using any product.