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There's a lot you can do to a stock 148 to really make the audio even nicer than it already is. Those are really great radios and the RX is one of the best you could get in a CB.
Playinmud: for the squelch on your 29, it might just need a RX alignment & squelch adjustment. You'll need to send it to somone with a signal generator, though. But the 148 does just have a better receiver so you'll still notice a difference. With a 29 (since it's AM only), you CAN get some pretty decent power out of those if you want. It's not uncommon to be able to get close to 50 watts peak (read from an active peak reading meter like a Bird43P) out of those radios if you know how to do it.
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