See
https://www.winnipesaukee.com/forums...hlight=antenna
for past threads.
In West Alton on the north side of a hill we get 6, 8 and 13, including subchannels, from Maine.
On the west side of Welch we get 31 and 41, including subchannels, from Vermont.
Depending on your exact location in Alton you can expect a range from zero to 4 or 5 main channels plus any subchannels. There may be some high on a hilltop locations that can get more channels.