You hear them at multiple locations?
There's nothing happening on 2m around 144.200 that produces constant beeps, anywhere I've ever lived or operated. The beacon subband is much higher in the band, and of course all amateur radio beacons I.D., usually continuously (on CW), so there'd be no guessing as to where they're coming from.
I'm guessing it's either something in your receiver (in which case, you might still hear it with the antenna disconnected), or something in your neighborhood like nearby VHF scanning receivers producing actual spurious radiated signals in the 2m ham band. A lot of times, those will indeed sound like "beeping," and they can often be peaked using a rotary beam to find out approximately where they're coming from.
CATV leakage on the 2m ham band is a common problem, but it usually doesn't sound like "beeping" (although I suppose it could sound like anything, since it's not supposed to be leaking, anyway).
WB2WIK/6