My Sennheiser Freeport FP21-B wireless. I have had this since it was new several years. I used it at a lot of gigs and never had any problems signal loss drop outs etc. So, I got it out as I want to use it at a gig' Evidently it is illegal to use now because of the 691-693 MHZ. Something about FCC selling everything in the 600 MHZ and up to cell phone companies and emergency public entities. I have been playing it at practice and around the house and it works great. Any reason why I shouldn't just go ahead and use it like I used to? I bought a couple of different cheap or whatever they are wireless since they looked good and compact and easy to use. In spite of several orgasmic reviews not my experience thye worked ok but dropped signal to often. THE ONES I BOUGHT WERE TOTAL GARBAGE, glad for Amazon free returns. Anyway if I have to to be legal I will buy another quality unit. Advise appreciated on what are quality wireless units now equal or better than my Sennheiser?