With All Due Respect - You Are Wanting To Establish A New "Small / Baby Repeater Station" In An Already Saturated GMRS Repeater Area. Also, Many Folks Have A Misconception About Their Future GMRS Repeaters & The Performance With The Mind Set - "I Have My Own Repeater & Now I Can Talk Several Miles Further."
Unless You Are Considering, At A Minimum, An $8000 to $12000 Investment Into A Repeater Site / Station With Utilizing Tower Rental Only, Installing New Cabling & Infrastructure, & Not Erecting Your Own Usable Higher Tower At A Higher HAAT - You Are Just Wasting Your Time & $$.
Wish You Well & Good Luck.......