I looked at my stats page for days between finds, and it is a bit misleading.
For example, the TEXAS Series letter "S" are my hides.
The stats say ~13 days per find, but in reality, the caches get found once or twice a year, by a large group of cachers, thereby skewing the stats.
I seem to remember back in the old days, that The Outlaw and Moosiegirl had an external GPS antenna system rigged up for their car. It might have been home made. I'll dig through some of my old records and see what I can find.