What do you know about Parks On The Air? https://pota.app/

A list of reasonably local POTA parks goes here.

US-1513 Lakelands Trail State Park - Livingston County

US-6643 Chelsea State Game Land, Grid EN82ah,  https://pota.app/#/park/US-6643

No POTA parks are within the Ann Arbor city limits, so here's an idea for Ann Arbor Parks On The Air or AAPOTA. We'll need a list of local parks with numbers for each of them; fortunately the Visit Every Park challenge has an authoritative list that just needs numbers, in the form AA-nnn issued sequentially per the official list.