I can think of so many reasons why I would not have used that antenna or mounted it in that manner. Check out the ARRL's antenna book or google the term "ground plane vertical" for details.
The ideal antenna for you would likely either be some sort of shortened vertical design on top of the truck camper (assuming metal roof for ground plane), or a low mounted 102" whip if you can figure out a way to mount it without it crashing into everything. The antenna you have has essentially no ground plane and instead of assisting in antenna performance, your vehicle is blocking the radiation pattern in basically the worst way possible. You'd honestly be hard pressed to find a worse place to mount the antenna than you have done.
SWR tells you very little about antenna performance. A 50 ohm resistor would show 1:1 everywhere but I doubt you'd be happy with how it worked.
CB is mostly a 4 watt AM affair on a frequency that is absolutely terrible for what it's being used for. If the CB were never invented, we would all be using mobile UHF-FM radios, which even at 5 watts with the right antenna would be clear as a bell over 30-50 miles and the mobile antennas would be 6-7" (that's inches) long. Because the frequency is in the wrong place in the spectrum, some pretty extensive compromises are necessary for at best kinda efficient use. Unfortunately, CB was invented in a time when these radios were thousands of dollars. Today you can get one for $25 on Amazon and if CB could be reinvented, that's what we'd all be using.
Focus on your antenna and not the radio, as the radio isn't going to make any difference in performance at all. You can't talk to someone if you can't hear them, and nothing is going to improve receive performance more than fixing your antenna install.
BradW wrote:
My buddy was talking about adding a 100 watt linear amp to his cb. Seems like it would only help if whoever you were talking to also had a linear amp.
Amplifiers are illegal on CB frequencies for a reason. 100 watts isn't going to change anything in how your radio performs in your car. For one, it won't improve receive at all. And as a practical matter, nobody on CB is trying to listen to someone whose signal is way down into the static, and so the improvement in transmit performance (assuming the antenna system was set up correctly and didn't just reflect most of that power) is not going to make the transmission more intelligible.
When conditions are right, and with the right antenna, it is possible to talk to someone on the other side of the world with frequencies very near the CB band. When they are not (which they haven't been for years), all the power in the world won't get you there. The CB world spends a lot of time focusing on all these illegal power modifications, but if those same people focused on antenna systems, they'd certainly appreciate the improvement in performance. It is illegal to talk to people over a certain distance away on a CB, though, so if distance is what you're after, get yourself a license and a nice HF ham radio rig. Although once you learn about the kinds of antennas that work well on these frequencies, you may not be interested in running HF mobile anymore.