Ya worked hard for those nice mid-winter frozen ground finds, Jeff. Are you hand-holding the phone or do you have a head-band holder for it ? With the phone's light on for the video, your battery must drain pretty fast. I can't say I've done any after-dark detecting, though maybe a little after twilight set in.
I took a metal probe into the woods, bordering a park yesterday to see if the ground was frozen under the heavy leaf mulch. A mixed bag, where some places, I was able to shove the probe easily into thawed ground a full 7-8", but in other places, only an inch before hitting rock hard ground. Hmm, maybe it was actually rock-hard rock
Thanks for inspiring some of us winter-time arm-chair MD-ers to think about maybe going out !
Nice Merc, Largie and eagle button...
Jim