surprised to here your 636 is not good enough for your Lee ? I had one RD for a very short time , it was to much concedering it was a powered NC mic . Although I ran a 575M6 for over 10 years on many radios , even then the audio only needed to be cracked open to have all that I needed at any give time. The 575M6 worked nicely on both AM/SSB , to have the best of both worlds , the 575M6 was the best hands down for me in a power mic. I think as far as AM is concerned , I know longer feel the need for back ground modulation , you can truly have the base station on wheels sound without a power mic and no back ground what so ever. (This can sometimes depend on how the radio is tuned ? or if a good echo board might be used ?) the best radios I've heard over the years in trucks and cars were the ones using 636s and RK-56s , usually with echo boards used for a touch of echo done nicely. Again .......How was the radio tuned and to what ? I think Lou Franklin was right when he said there was just no need for a power mic on a cb radio if the radio is tuned right. Experiance is my only teacher , The D-104 Hand helds are best suited to be ran on base stations or radios that have been lightly tuned on the modulation side of them , Why have nasty back ground if you can sound loud and proud without ? Although some stock mic's are very bad that come with certain radios over the years , there has been there fair share of good ones as well (Cobra coffin style and the 1000ohm type mic's there's also a very nice Ranger Stock mic that works great as well as the others on AM/SSB) I suppose power mic's in the mobile for me have come and gone. I just don't want all that noise behind me anymore. Good luck with your RD , I was just surprised to here the 636 was not good enough for the Lee ? most guys I know run RK-56s on them and they all have base station quailty loud and clear audio , The only problem I've noticed over the years with guys running NC mic's was that they just couldn't get it through there thick heads that they needed to eat those mic's for them to work properley. Go figure ?