Confidence: I'm as sure as I can be.
Notes: The key features to split this from the similar Light Orange Underwing are the antennae (serrated in Orange and slightly feathered in Light Orange) and the pattern on the underside of the hindwing.
The picture does not show the underside of the hindwing, but if you observed it and can describe it then an ID may be possible using that feature.
The antennae here are slightly out of focus. I don't get the impression of any feathering so if you can indicate that the moth was a male and confirm the form of the antennae then an ID may be possible using that feature.