On May 8, 6:16 pm, Roadie wrote:

Which 300GHZ AM receiver did you have in mind?

Any theoretical 300 GHz AM receiver. I want to listen to signals from
far outer space.

Since AM is more susceptible to magnetic disruptions, I'd figure, and
AM radio is more likely to pick up interferences from outer space,
than an FM radio. The question is, which frequency is best for this?
Frequencies that are too low are sealed out of the ionosphere, while
frequencies that are too high rapidly disappear [line of sight].