I have had houses up for 2 years and still no martins

My wife has hosted sparrows in her martin house no martins.

Martins can be particular about where they set up shop. They like to be out in the open, away from any trees, shrubs, or anything that could conceal predators. They like to be within 1/2 mile of a large water-source, where they'll catch 100% of their food for chicks. They also like their houses to be up 10-15 ft.

Got all the conditions....
There are some showed up this morning....don't know if they will stay....they did this last year.....showed up and left....

Their numbers might be down for some reason. Over the last couple years, I've only managed 4 pair. In earlier years, I had 2x that many.

They are gone now.......