Alan-
Welcome to T net! I'm up in the northeasten pa area - how far are your from Carbondale pa? I'll tell you what man- I'm getting an AT pro in a few weeks- as tax returns come in...I've heard of Mt. Top but am not sure where your at...anyhow, like people on here a suggesting check out youtube for ideas about using your detector- I have had (and found it really good) an ACE 350, and a minelab E-Trac - the best advice I can give is dig everything at first- if it appears to be something good -good deal, if not still worth checking out because you won't know what it is till you dig it up (no detector is ever going to give you more then just a good guess as to what's there)... it takes a while to get to learn what the detector is telling you- if your AT pro is like the ACE350 you can use the buttons to turn off unwanted signals to discriminate out things- but before you stop it from making a tone- over say, pull tabs, keep in mind gold rings will sound off like a pull tab. I even played around with my Ace350 and just searched for nickels/ rings. you never know. I'm still learning the Etrac- it's a more complicated machine, and I've found goodies with it- so it's all a how patient can you be learning the new sounds game?
this video has parts - I plan on checking these out before getting my AT pro- but the thing about detecting is if you just go out and look in my opinion your going to be frustrated - what you have to do is consider where the people have been, find places like old swimming holes, go check them out- old swimming places, beaches, river crossing, old mill areas, places that I love are old baseball parks. if this is your first detector your best bet is to take a few weeks out and just go out and play with it -swing slow- every tone you hear dig. once I realized that a nickel signal was actually a gold ring I never passed up a nickel signal again! (on my E-Trac anything that comes up 12-13 or 13-13 is going to get dug up- and anything that makes a violin tone is going to get me drooling- as it might be silver! on the 13-13 it might be a nickel, ring or can slaw- you never know!) it's going to take a while because the learning curve is high, but if you take your time and enjoy the ride you'll find a ton of stuff.
I just figured out where you are - other side of WB. if you check out 309 edwardsville -forty fort area there are some good old baseball fields I've seen in my travels but never had a chance to stop in on 309 north just out of the populated areas are two parks I think I passed for work...I work over in pittston - if you ever get the idea about wanting to check out scranton -the park at CMC/ hospital (i think mcdade park) I'd be up for it- anyplace new I'm up for...just waiting for it to warm up and ground to thaw...water needs to be warmer too...

I'm not too crazy about going under in the spring thaw, but I can't wait to play in the water and find some of the things I keep hearing people lost! anyhow - pm me if want to- but right now I'm on weekend shift until around april, and then will change back to days having Fri-sat-sun off.
Alan since people on thread has mentioned how to dig a plug -this is a worthy video. this will save you some hassle - since this is the number 1 issue we face is losing hunting opportunities because some people won't take the time to not kill the grass, and not make a mess, and not fill the hole they dug...
anyhow - if you need anything PM me. I don't have the site/email tied in to my phone anymore - but check my email daily.
~Mike F.