The Winegard antennae is amplified. Somewhere in your coach is what looks like a receptacle plate. It has either a red or a green LED and a small Off/On switch. On the back of the plate is the cable connections and amplifier.The cable from the antennae goes to this and the cable for your TVs comes from this. When the LED is lit, the amplifier is On.
As to the addons. They work well for us. They provide a stronger digital signal pick up , but it seems to me, make the antennae more directional. If you're using your coach close to strong TV stations, you may not need the addon. It's not expensive ~$25.00 and hooks onto you existing antennae if your antenae is a batwing type. The batwing type is the antennae the is a long rectangle with the tips turning down.
Jim and Lynda, (Sophie, Jake, attack trained killer Shi-Tzus :-))
2003 Fleetwood Expedition 38N 2005 Saturn Vue