Water Hole Frequencies within the Microwave Range

Just wondering if the background noise (1420 to 1720 MHz) is what we are looking for and tracking using BOINCLogX which then gets plotted by SETI@Home Mapview? Or, are we looking for "anything" that shows up persistently and distinctively, within the range of 1420 to 1720 MHz? I thought I was looking at the "water molecules" noise instead of "background" noise.

"Hydrogen atoms emit at 1420 MHz (a wavelength of 21 cm). Hydroxyl molecules, composed of one atom of hydrogen and one atom of oxygen (OH), emit at four specific radio frequencies ranging from 1612 MHz to 1720 MHz. When a hydrogen atom combines with a hydroxyl molecule it forms a molecule of water, the most essential molecule for life as we know it. Thus, the range of frequencies from 1420 to 1720 MHz is called the Water Hole."

The emission line of ionized Helium isotope (3 He III) is 8,665.650 MHz. While Arecibo can listen from 50 MHz to 10,000MHz, I understand that the feed used by SETI@Home extends only from 1200 MHz to 3000 MHz. I read that the Allen Telescope Array listens continuously from 500 to 11,200MHz, so it can be said to cover the Helium emission.