Here is the link to the page. Others have similar products. This is called the b2kliso that is b 2 k l i s o and cost is $39.95. For me it was magic, severe r f in my audio on 75, put in isolator and puff, r f i gone. http://www.packetradio.com/catalog/index.php?main_page=product_info&cPath=11&products_id=1938 73 Butch WA0VJR Node 3148 Wallace, ks.