I put a Dakota MURS kit (https://www.dakotaalert.com/store/murs-alert-products/murs-bs-kit/) at our house - transmitter uses passive infrared detection and runs on batteries. Receiver is in the house about 500 - 550 feet away and higher in elevation - no major obstructions but terrain and...
^^ This ^^
My wife grew up with this sauce and likes it on everything and now I'm using it as much as she does. I would have never thought to try it on watermelon but surprisingly good.
Another option is Kotic Kustoms in Woodstock on Bells Ferry Road just about 1/2 mile north of Hwy 92. Good guys and will work on anything, although Harleys are 90% of their work; they also do customs and a lot of modifications that others won't touch.
72 BMW R1000 with sidecar; had the head work done to replace seats and valves to tolerate unleaded gas; needs some basic re-assembly; have many new parts including a new sub-frame for the sidecar.