Handheld?

I use a Cherokee AH-100. It's got a couple of neat features, like it comes with a cigar lighter & external coupler that slides on in place of the stock battery for mobile use. The antenna connector is a BNC, so it's easy either have a male BNC put on the "radio end" of a magmount's coax, or use a popular SO-239 to BNC Male adapter to take a typical PL-259.
The stock rubber duckie is horrible except for use within half a mile or less; it's mostly a coil at the base, and a short (like 10 inches) rattail that sticks up out of the coil. It's about like an RF choke in performance, but it is sufficient to at least hear nearby locals.

This radio isn't usually available new anywhere, as it didn't meet the FCC's draconian regulations about what could be certified as a CB in the US. It takes just a couple of solder bridges to make it into a CB + 10 Meter radio, but it also has SSB & AM modes. It won't do FM, nor tones, nor TX offsets, and only tunes in 5 kHz steps, none of which match up with typical ham calling frequencies.

It comes stock out of the box set for the CB channels, and there's a choice of showing either channel numbers or frequencies on the display. It will scan for activity, has a low power setting that can be toggled to save battery juice, a toggle for mic gain, and one for RX gain. And there's a display backlight that times out after around 10 seconds. It's enough to be able to read the channel or freq and see which options are engaged, and shuts off to save battery. I don't know if there's a setting to allow the backlight to stay on all the time, but I wouldn't want to do so if I'm using the portable battery pack to power it.

So, if you can find one, it's a decent portable and the included adapter makes it a snap to go mobile. There are top mounted external mic and spkr/headset jacks so you don't have to hold the whole 20 ounce (or so) handheld body with the coily cables up to your face to use it.

As an alternative to the Cherokee, Midland has a similar AM-only handheld that uses a nearly identical mobile adapter. The Midland model is 75-822. It has 5 memory channels and dual watch, like the Cherokee, and its mobile adapter and refillable battery shell fits both radios, although its outside dimensions are enough smaller than the Cherokee's body that it can be felt, and it's black instead of the Cherokee's gray. When NiMH AA batteries are used to stuff the shell, they can be recharged via a built-in DC charger jack (on the shell), and an LED lets you know when current is being supplies to the pack. The charging current isn't enough to run the radio, however. When I'm using my Cherokee with the Midland battery shell, I switch to the mobile adapter and use a cigar lighter charging cord to keep the detached battery shell charged up for next time I get out where I'm going to use it as a handheld.

Here's the Midland. Note that almost every online dealer has these for less than the MSRP that Midland quotes:
https://midlandusa.com/cb-radios/product/75-822cb-radio/

From looking at the boards and schematics in a couple of these and one of the Magnum handhelds, they appear to have been built at the same factory; not much surprise there. The Magnum can also be made to use FM via some jumper choices inside the radio, although only AM & SSB are useful for CB.

Of the three handhelds mentioned, only the Midland is usually available new from a dealer, as they're FCC Certified for CB. The Cherokee is no longer being imported to the US, and I'm not sure if the factory is still even cranking any of them out.

I've been pleased with my Cherokee, as long as I remember to hook it to a decent mobile antenna. It doesn't have any real noise limiting for vehicle noise, but I can hit the RF Gain switch to numb up the receiver a fair amount. That takes my spark-based ignition system's noise to about zero. Then I leave the squelch pot open so I don't miss traffic from nearby.

The Midland also has 10 weather channels in its receiver.

The Midland's version has a slightly more efficient rubber duckie -- it's a helically wound shorty instead of the Cherokee's base loaded duckie. It shows more field strength a short distance from the radio than the Cherokee's antenna.

While the Cherokee's SSB is a nice idea, it's hard to squeeze more than about 8 watts P.E.P. out of it, so it's not a potent performer on the 10 Meter band. The clarifier surrounding the squelch pot makes it easier to tune in strong SSB stations, including on Ch 38 LSB, the TX freq is locked. There is a mod to unlock the clarifier, but I didn't put it in on my radio. I'm used to working on surface mount components and boards, but everything is so small that I'm afraid that the requisite jumpers to enable an unlocked clarifier on TX would make it unstable. And most people I've run across, even on the ham bands, won't really take the time (?) to tune to an off-frequency station for a chat. At that point it becomes, practically, only useful as an AM radio.

There was some talk of a distributor in the US working with the manufacturer to re-introduce an FCC Certified version of the Cherokee handheld, but I understand the deal kind of fell in a heap. I've had mine for years, and I see them pop up on eBay once in awhile. But given the choice between another Cherokee AH-100 and the Midland today, I'd probably go with the Midland.

I've also got a couple of different Realistic (Rat Shack) handhelds for AM only, and their antennas suffer from the same limitations as the Midland and Cherokee, but they still have BNC antenna connectors. So as long as you keep the battery pack(s) charged, or mostly listen rather than transmitting, they work pretty well with an external antenna, and one of them also has weather channels.

If weather reception is important to you, keep in mind that a loading coil will likely filter out any VHF frequencies before they can get to the radio, so the longer the whip portion of the antenna the better, especially if there's any shaft length under the coil (like in a center load or top load design).

Hope that helps.
73