Can they easily turn the power down or up - YEP.
People should watch the movie UHF.
Read their Bio -
http://en.wikipedia.org/wiki/UHF_(film)
A inside joke of 14 KQV a old Pittsburgh Am Radio station was when they did a skit one morning on the radio about how someone in Pittsburgh opened a television station on channel 1.
There is no channel 1 in the USA.
They told their listeners that you could receive it if you held the knob of the television between the UHF and channel 2.
People ran to the television stores to try to get converter boxes so they could watch channel 1.
Or the Fox viewing position on Married With Children. When Married With Children came out - it was on Fox and most of the Fox stations were on low power UHF and people had to do all sorts of strange things to receive it. Family's holding hands and touching the rabbit ear antenna for a half an hour at a time or putting tin foil on the end of the antenna to produce a little more gain so they could receive the channel.