I just purchased a scope and it will be here this week. My question is looking at samplers to monitor my signal. Been looking at a couple of samplers. Anyways, one fits the Bird 43 and is at -50dB and the other screws on to the side of bird meter and has a higher wattage rating, but is only -40db. I don't really understand the db thing and how will this affect signal? I know it reduces signal. But that's about it. Can anyone explain this to me please? Or at least send me in the right direction.