I had pretty much the same questions in the Schenectady County area when I got my HP-1 a couple months ago. Someone reminded me about the FCC database and it's been an invaluable tool for finding additional frequencies. Here is the link to the site:
I took the liberty of doing a VERY quick search for you and found these "Hunter Mtn Ski Bowl" freqs. Not sure if they help you or not:
ULS License - Industrial/Business Pool, Conventional License - WQRP711 - HUNTER MOUNTAIN SKI BOWL INC. - Frequencies Summary
I also recommend playing around with antenna search:
AntennaSearch - Search for Cell Towers, Cell Reception, Hidden Antennas and more.