ALL RC radios in the United States are Narrow Band. This was mandated by the FCC years ago and all RC radios in the 72 Mhz range must comply. This is what moved this hobby from 5 available channels to the 50 that we have now.

From what I understand the "Naro" is simply a product name. GWS has several names for their receivers, Pico, Naro, and Micro. The Pico series is 4 channel, the Naro series is 6 channel, and the Micro series is 8 channel.

According to GWS's website ( [link]http://www.gwsus.com/english/product/receiver/r6n.htm[/link] ) all of their Pico and Naro recievers require a micro FM crystal that is available only from GWS.

Once again, according to their website, you must order the specific receiver for your brand of radio. For Futaba/Hi-Tec you will need to order one that is negative shift, which will have a sticker on it that says "F". For JR/Airtronics you need one that is positive shift, and will have a sticker that says "J" on it.

Hope this helps

Ken