Random thought:
Airshows require the staff to travel to where they are. Set up, tear down move, set up tear down move.
There is no real good reason to use UltraSonic sensors for wind as far as I can tell, and having futzed with an RM Young and having a minor bump move the little transducers a wee bit, enough to cause it to lock up, put it out of commission. I'm thinking a conventional wind monitor with cups or propeller would be a bit more robust, but there are some Vaisala ultra that look good and are meant to be on ships and such with some ice. Some Met One devices are even more precarious in their look.
I guess other than looking to get experience with ultrasonics, why go that (expensive) route?