I'm using a PSR-800 and realized I don't receive any radio traffic on I-80 between the TA at MP 377 and approximately MP 395. I switched to an external antenna with no results. I verified there is radio traffic by using Live Audio on my phone. I checked my primary and alternate control channels against RR database and I have all of Laramie County channels programmed. Any idea why I am experiencing a dead spot in this area.