If you are talking about the Mt. Mansfield transmitters, then you are talking about some of the highest transmitters in North America. Practically speaking, the issue that you will face in Wallingford is not the sheer distance between the transmitters, but rather, the mountains that lie in between the transmitters and your location, as each mountain will refract or block the signals coming from the transmitters. I personally know that reception is possible in VT at substantial distances between Mt. Mansfield, as my folks had a house down near Stratton Mtn, and I used to be able to get channels 3 and 5 from the Burlington area without a problem. Our house was about 1500' ASL, about 2/3 up Snow Valley, and from that location I was able to pick up Boston , Manchester, NH, Burlington-Plattsburg and Mt. Washington and even Montreal VHF, at a distance of 170 miles!. Because of the location of the house on the hill, Albany wasn't possible, even though it was actually closer to us than was Burlington. UHF was never an issue in those days, as WFFF and channel 22 weren't on the air in those days. Theoretically, under flat conditions, the Mt. Masnfield stations should easily reach over 100 miles with a good signal, as people in Montreal will tell you, the Burlington stations come in in Montreal without much of a problem at a distance of almost 90 miles. So, to answer your question, yes, in theory, 4000'+ of transmitting height should make reception pretty easy at a distance of 75 miles, but the geographical features of the state are working against you. In the right location, good reception should be possible, but reception is almost impossible to predict because of the terrain.
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