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Not sure I can help find the show you're talking about, but the event you're describing sounds like one known as the Kelly-Hopkinsville Encounter. It took place in Kentucky in 1955. People were "under siege" in their house by supposed aliens out in the woods.
https://en.wikipedia.org/wiki/Kelly80%93Hopkinsville_encounter
Edit: I can't get the Wikipedia link to work right, but you can look it up by name.
Edited by EricaB

Hi all, I'm hoping someone can help. This is going back ten, maybe fifteen years - I remember watching on UK tv late at night a short live action film/documentary set in an isolated house in the US countryside. A bunch of teens and I think younger kids too keep seeing this weird red light coming from outside the house in the woods. It was filmed kind of like "found-footage" IIRC, and was low budget. It gets genuinely scary later on when ultimately the house is approached and entered by a group of "grey" type aliens who look a bit like the ones from Close Encounters crossed with the Star Wars Cantina band. All the kids totally lose their shit (of course) but I can't remember how it ended. I don't think the aliens attacked anyone- it was more that their silent, encroaching presence was just plain creepy. It was cheaply shot, but I was very, very freaked out by it, as at the time, it seemed so eerie and strangely believable. Anyone know what this could be?