I operate my 480 primarily on 6 meters. I do not have any of the optional filters installed. I am wondering if purchasing the optional 1.8 khz, will help on weak signal work. QRM is not much of a problem for most of the year, but I wonder if having the filter will help sensitivity on 6, by cutting out the wide band noise, which may or may not be knocking my rx sensitivity down. During certain times of the year noise levels can be higher than normal, and maybe this filter will help dig out the weak signals. What say ye?