Back in the days of double income and no kids, the one time i left the flip-off front on my lovely Sony CD/Radio it got nicked Heard car window smash, jumped out of my chair about three feet to the window and they'd already gone. They left the main unit though, so unless they had exact same model it was useless to them.
Oddly our boat has a little rubber duck aerial on the roof (well, the bottom half anyway, top bit has snapped off), nicely done aerial cable into corner cupboard, but has never had a radio or speakers fitted 🤷♂️ I won't be adding one.