Well being a former trucker I know a few things about CB's, and could offer a few suggestions. First make sure you have it grounded good. Next your coax is critical. Most CB shops recommend an 18' coax. Something to do with wavelength. If its old, get a new one. Many truckers will replace thiers every year or so especially if it is routed anywhere where there is a sharper bend (like routed through a door seam or trunk seam where it gets a small kink in it everytime the door or trunk is closed). The coax can break there and manytimes this can cause the exact problem you just described. Then do what AmFan suggested. That is called matching your SWR. SWR meters can usually be purchased at CB shops and truckstops for around 10 - 15$. Of course for around the same price, maybe less a CB shop will probably do it for you. It is also possible the people you ar trying to talk to are just too far away. Stock "out of the box" CB's are regulated by the FCC to a maximum of 4 watts output which won't get you very far. If its a decent CB you can take it to a CB shop and the will "kick it up" to where it will send at about 30 watts. This dramatically increases your range. Of course if you do this you may also have to replace your mic. A lot of times once you kick em up you need an noise cancelling astetic mic. With a typical mic you can hold it about 2 to 4 inches from your mouth and talk and people can hear you just fine which is ok with a stock radio because its not putting out a lot of power. An astetic mic has a little guard if you will on the face of the mic that you actually need to touch your lip to when you talk. Its kinda weird and I had a tough time getting used to it. The reason is is that the mic does not pic up much sound that is more than an inch or so from it (unless the sound is super loud) because if it did no one could stand to listen to you because of all the background noise you would be sending. When I first got my really really nice $300 radio (kicked up of course) I thought it was crap cause no one could hear me talking. I found out that that was the reason. So anyways maybe I said something that will or won't help you. Don't be afraid to head to a truckstop CB shop to get some help. If I may ask what equipment are you using? Brand of CB, style of mic, coax, and antenna. Knowing that may give me another idea or two.