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The original Die Hard had the bad guys using Kenwood TH-45 hammy handhelds.
Not sure what LAPD were using back then (1988) but if it was UHF there's a smidgeon of truth to them being able to talk back and forth like that on the "CB".
Those look a helluva lot like Sabers, there (a form factor that will always be near and dear to my heart). In the second pic, you can kind of see the bump of the accessory port cover. You're right, though, the knobs look like they've been pulled up about 1/8".
Given that there's no rocker switch, and the apparent size from the other photos, I'd say it's a non secure conventional Saber with a low-cap battery.
McClain called "breaker channel 9" and was also told by the dispatch supervisor that channel 9 was for emegency use only and she would have to report him to the FCC just befor he shouted "does it sound like I'm ordering a pizza?" and the gunfire was heard in the back ground.
Most of the radios used on movie sets are dummys, just plastic. You occasionally will find that they use rental radios, especially if they filming a technical or difficult scene.( look on the floor of the car for the PT-400 in White Lightning with Burt Reynolds as he leaves the meeting with the Sherriff) They use the radios for coordination. BTW the chase scenes were filmed on the Taconic State Parkway, just north of State Route 6 in Carmel, Putnam Valley and Mahopac while it was under constuction. They also closed the parkway for extended periods of time, 6 hours or more during filming. They even closed it on Labor Day and traffic backed up for 10 miles in both directions. Also since I am local, the local papers ran a story that the producers even offered to blow up the toll plaza on the Hutchinson River Parkway, and save Westchester County the $100K cost of demolishing it, but the locals with money squashed it.