Best place to buy good coax.

You can go to CB shops.

Don't be sold on the pretty braided coax in truck stops.

I bought a whole new setup once, everything. My transmissions were all garbled and such. After going through several things including grounding my antenna's, it turned out that expensive pretty braided coax was shorted out of the package. The black coax works just as good. The main thing is to use the thicker cable and have a long run under the dash or above. I think it's RG6 or similar.

 

Best Buy had various grade of coax from good, better and best.

 

There are a number of places that sell coax cable on the internet. One such place is www.Universal-Radio.com/catalog/cable.html
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For those newbies and wannabes, the standard coax for a non-amplified single antenna cb radio setup is 50 ohm resistance RG 58 coax cable. There is no requirement for 18 feet of coax. That is an old myth. Many people prefer to upgrade their coax to 50 ohm RG 8 or mini 8 as it is sometimes called. I believe RG 8 is what CondoCruiser is referring to as RG 6 is 75 ohm cable which is not appropriate for cb radio.
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Personally, I prefer 12 feet of RG 58 which gets 95.92% of the signal from the radio to the antenna. Compared to 18 feet of RG 8 that gets 96.04% of the signal from the radio to the antenna. Sure, 18 feet of RG 8 gets 0.12% more signal to the antenna but that 18 feet of RG 8 can cost twice as much as 12 feet of RG58.
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Do not tightly coil excess coax into a small loop. It will act like an electronic choke with its own impedence. Thus affecting your antenna tuning for the worse. Form excess coax cable into the shape of a figure "8" that is 10 to 14 inches in length and secure it with tape.

 

I wouldn't put RG-58 in a toy car

That's just me I guess

Copper Electronics is in Louisville KY, they will sell you the exact length you need to avoid coils of coax. Run a piece of wire for an exact measurment before you order the coax, dont forget to pay the few $$ extra to add the PL259 on each end if you cannot solder your own on.

http://www.copper.com/cart/index.php?cPath=39_73

 

Well you can also try http://www.cablexperts.com/