What big coil do you recommend for the Racer 2, and why? (1 reply)

I want a giant coil to hit some locations I've already pounded with the OOR and the 11x7 coils.

I'm leaning toward the Makro 15.5x13 because I like the brand, but what other big coils should I be considering?

I still need to be able to detect coin sized objects too.