Hate to do it, but I had some legal issues from the past knock on my front door today.
I have a Field Marshall 10 collar system with 2 Marshall and 2 Midnight Tracker collars, four collars total. The receiver frequencies are 217.005, 217.015, 217.025, 217.035, 217.045, 217.055, 217.065, 217.075, 217.625 and 217.675. Marshall collars are 217.025 and 217.035 and the MT collars are 217.075 and 217.625. All four collars have treed switch
The system works and all four collars work. The receiver needs to be tuned to work at full capacity again. Right now it's getting out around two and a half miles. I called Marshall and they say they can have it back to new with less than 125.00. If interested call or text 281-468-6584 or you can PM/e-mail me through ETHDs. I'm not always around the computer, so call or text would be better.
The system and collars are worth about $800.00 to me, closest offer to that takes it.
Here's a link to information on the receiver
http://www.gundogsonline.com/dog-tracking-collar/marshall-radio-field-marshall-10-channel-system.html