I am not an expert but one who actually worked on a over-the-horizon radar system. This entire article is predicated on the RF reflectivity of ionosphere being

I am not an expert but one who actually worked on a over-the-horizon radar system. This entire article is predicated on the RF reflectivity of ionosphere being stable during its measurement of computerized triangulation, when in fact that the sky was in sunrise mode where the ionosphere starts to fall to a lower altitude. Such sunrise/sunset transitory phase is never a clean delineation of RF reflection but instead a noisy raster of bounced RF, much like an oversized blanket of aluminum chaff.