Appalachian Trail Golden Packet rf-path-analysis GP-GRYLCK to GP-EQUNOXMount Greylock to Mount Equinox RF Path Analysis GRYLCK-12 to EQUNOX-13 - VHF GRYLCK-12 to EQUNOX-13 - UHF Packet Low Power GRYLCK-12 to EQUNOX-13 - UHF Packet High Power