A couple of years ago, I bought mine from Freedom Cycle in Reno, Both for Radio and CB. I have not noticed any loss of reception or communication. The pair cost like $80.00 ,simple screw in installation. The best part about it is no more dealing with antenna's and garage door interference Dont know if the # is still current but here is the one I have 530.865.7010[8D]

 

I have to take a look at those. Will make it ewasier t ocover bike when stored to.

Thanks