Is it typical for the sensitivity of an NC300 to fall off at higher frequencies? It makes it rather deaf on 10 meters. Here's what I find on mine after alignment normalized to 0dB on 7.2MHz: 1.9MHz -9dB 3.8MHz -5dB 7.2MHz 0dB 14.2MHz -2dB 21.2MHz -5dB 27MHz -9dB 29MHz -16dB Thanks - Paul