Bought this radio for the Jamboree. It worked very well on the trail, out of sight, over hills and valleys. On the Highway, I can only inderstand about 1/4 of conversations, is it the radio, or just the speaker? What's the deal with extra speakers? Are they powered? Expensive? Most transmissions sound like the speaker is over-driven, very hard to understand. It was crystal-clear on the trail. Never used a CB much, but I figured, since it was in the JEEP, I would listen to it on the road - it didn't keep me much company!
If you have a RF gain control, try turning it down some. Most truck drivers clip the audio limiter, which will over drive your receive at close range. Also a external speaker is usually pointed more at you, so you don't have to turn the volume up so far to here it over the road noise. You probally don't need an expencive ext speaker, just a larger diameter may sound better. Like 4 inch.
The speakers they put in radios are pathetic due to size, enclosure and expense, they're trying to build the cheapest "functional"radio they can.
External speakers make a world of difference, you don't need anything fancy, my favorite was actually a cheap set of walkman speakers, I just cut one off.
"But it does me no injury for my neighbour to say there are twenty gods, or no god. It neither picks my pocket nor breaks my leg." - Thomas Jefferson, Notes on the State of Virginia, 1782
Arguing with a truck driver is like wrestling with a pig in mud, eventually you realize the pig enjoys it.