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Update Well, I used my VOM to check the resistance through the antenna and base alone (disconnected from the antenna cable). Extended, the resistance is around 1 ohm, but tied down, it is around 300 ohms! HUGE and very reproducible difference! The "antenna fail" message on the radio screen...

Thanks to all of you for your advice. I think what I'll do is use my VOM to check for continuity with the antenna straight and bent. I'll disconnect it from the antenna wire (to avoid RF burns and to isolate the antenna/base). Y'all have mentioned checking the ground connections in the truck...

Yikes! Sort of like assuming all guns are loaded until you prove it's not yourself! I'll start that habit now. Thanks for the heads up!

duplicate post

I am using CB, only 4 watts. Is there a risk for RF burns with CB, or is this more likely with amateur and military radios?

I actually replaced the base with an NOS one. I know that doesn't mean it still can't have a break, but this thing is pristine, and the exact same thing is happening with the new base as with the old one. Makes me think this has to do more with physics than anything else.

I wondered about that, but the tie down cord is just paracord, and it came with the clip as military surplus. I have tried holding the antenna with my hand rather than the tie down, and it still fails. (not sure if my body hindered the antenna any)

antenna fail The SWRs are better when the antenna is up. However, when tied down, they approach 3.

I have a CB radio on my CUCV with an AB15 base and the MS116-117-118 antenna. The antenna base is new/old stock fresh out of the box. I have cut my whip to be a total of 110 inches long from the bottom of the base to the antenna tip. I am using a new Cobra radio. My antenna tests good when...