Having lived in Trenton for 20 years, i have learned that when arriving they talk to Terminal on 128.4 and once handed over to tower (128.700) when they are close, usually within 20 miles and at an altitude of about 8,000 ft. once they depart they leave the tower fairly quick and are switched to high alt enroute freq's. I only hear them within 40 miles of Trenton. The only milair i can hear other than local Trenton traffic is the Refuelers over New England. fyi and my 2 cents