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Ok; then I reckon it's a DAS product. I don't know that it makes a difference; or if it does, if it's a meaningful difference. I was just curious. I'd actually be interested in seeing a comparison of DAS products, as currently made, with the companies products from before they were bought...

Now, is this a Francis antenna, as they are currently manufactured, as a company owned and operated by DAS? Or, is this an older Francis antenna?

I put an amp on mine. An RM KL-203 pairs nicely with it. That's what I've got, and I've since found it to be a popular combination. Also, there appears to be a mod that opens the clarifier on it. (Not sure what the point of that is; that seems like a more useful thing for "drifty" radios. But...

@Needle Bender: Yes, that might could work. Bending the top of the top antenna back by 3' would allow me to slide the mounting assembly up from the bottom of the grab bar, to the top. (If the power radiation is highest at the center, then moving the center higher up is good, yes?) Then doing...

Lots of good information, and stuff to ponder and consider; thank you all, for the well thought out responses and discussion. I knew from the gitgo, that this project would be a compromise. It's my understanding that mobile antennas, in general, are a compromise. I'm OK with that (not much...

Right; 1/4 wave on top, and 1/4 wave on bottom... which has been my intent, all along. Strangebrew posted a suggestion, above, that I intend to investigate the feasibility of, but prior to that, I was still looking at 1/4 waves; an uncoiled, full length 1/4 wave for the top, and a compacted...

6 years later? I would be surprised.

Standard phasing harness and 50 ohm coax is pretty much what I had in mind. In regard to bending the bottom half; that's a new thing to consider. I hadn't thought of that. But, how to hold the bend? I'll have to ponder that one. Thank you for the ideas.

And now you have tried to curse me with a normal life! :eek: I'll have none of that! Nah, no hurt feelings here, lol. I was just returning the snark. :D

The point? Well, I'll get to that, after I address the wheel, I guess. But, first, I'll point out that I don't have a co-phased antenna system, currently. I did try that, once, on my 1st truck, which was, for all intents and purposes, identical to my current truck. The standard co-phased...

The bottom half of the antennas will be 1/4 wave, 4' fiberglass whips. The top half will be 102" steel whips, with rods added to make them 108". Mounted at the bottom of my grab bars, the antenna height will be just under 14.5 feet. I would prefer the bottom half of the antenna to be at least...

"Determine your desired phase angle" Please pardon my ignorance; but, what does that mean? "Forced current approach " Again, what is that? It reads like you just gave me some very sound advice, and I would like to take it into consideration, but I completely lack the education to know what...

The matching device is one of these: I'm currently using it; it does very well. I know that the radio requires 50 ohm impedance from the coax, and I know that co-phased antennas want... what, 70? 70-something? Ohm impedance. (Still trying to figure the math behind that one) But, where is...

Wonderful. Now we've gotten the obligatory unhelpful, uninstructful, and condescending commentary out of the way; very good. (y) Moving on...

Which part is inefficient? Coax length, antennas, or both? And why? My current dipole setup consists of this antenna as the top half: https://www.zoro.com/k40-antenna-open-helical-48inh-k40bcmax/i/G0157888/?gclid=CPOBlevn89MCFY22wAodHDEFAQ And this antenna as the bottom half...

For those of us who were not born with soldering irons in our hands, this is a great gadget for grownups, too. Of course, one can never have too many flashlights, lying around; especially if they suck extra life out of dead batteries.

I want to run cophased dipole antennas on my truck. I'm currently running a single dipole, and have been mostly happy with the setup. My current antenna is mounted to the driver side mirror bracket. This leaves a "deaf spot" on the passenger side, rear of the truck, that I would like to...

By all means, keep asking questions. That's how you learn. I've actually been quite impressed at your persistence, and willingness to try all suggestions, instead of just deciding that it's too hard, or too much of a nuisance, and giving up. Like 222 said, above, the project will require some...

Looks like those "type 2 toroids", referenced in that article posted by LooseCannon, are pretty inexpensive. Frys Electronics has them for just over a couple of bucks, a piece. http://www.frys.com/product/2320969?source=google&gclid=CIzzzaHO7tMCFQeBswodDcQMvw That signal sniffing trick was...

Cobra has the 25LX and the 29LX; those are fairly modernized. But, to my knowledge, they don't have a similar offering in SSB. The modern truckers don't run with CB's like they used to, sadly. Apparently, many younger drivers are content with the information that they obtain from smartphones...