Park AA-048 is Esch Park in the Ann Arbor Parks On The Air numbering scheme. 

Describe Esch Park to the amateur radio operating looking to set up a portable or mobile station. What is the grid location and elevation? Are there any repeaters or other transmitters nearby? Does the park have an elevated location to set up an antenna, a tree to loft a string into, or a flat grassy place to set up a vertical?