Id be interested if anyone has any thoughts or results from finding an effective and noise free at LF/MF PC sized 30 min UPS -Ive used laptops in AK in the past but have gone "tower" for the past year on one of the systems but the AC supply in Alaska is proving rather unstable, (its been off three times overnight with the weather again)

Im living in a ranch style house so dont have any Faraday cage advantage  effects from rebar/brick/block - what noises are produced sadly go straight out to the antennae. Im mulling over a purchase and would like (I think) a pure sine wave version...

thanks Laurence