I'm curious how you guys handle your antennas on armored vehicles. My prime interest is WWII vehicles, but I'm never sure what color to make the radio antennas...are they usually the same base color as the vehicle?

As far as I know, they are.

Yeah, just about everything in the US Army inventory in WW2 was specified in Olive Drab. it's probably the #1 reason modellers give for buying and building so much more german WW2 stuff..the german stuff is just more interesting to paint.
I don't happen to agree completely with this...but it takes a bit of study to find WHY the US stuff is actually interesting and deserves a fair shake.

I would expect that most German WWII AFV aerials (pole or staff antennae) were painted industrial dark gray, dark green, or a satin black by the OEM - these pole antennae were made of painted rigid copper tubing and were a removable/replaceable item (and vehicles often carried a spare) that was obtained from the fitting depot and equipment factories. Like other items attached to German tanks - tools, extinguishers, gas-cans, spare track, etc., antennae were not part of the panzer to get painted at time of assembly but were installed later onto a finished vehicle, so seems likely that they went on in the color they were made with.

Other antenna - WWII US stuff, and those appearing on more-modern equipment - were and are made of various non-metal materials and generally flexible. These, like the aerials found per my experience on US tanks ca 1975 for example, were not painted - they came in dark olive or greenish or near-black colors not at all like the OD a vehicle was painted in. Being flexible whips, they would not hold paint very long. The most-recent stuff, which includes fiber-glass and various plastics, probably comes with dyed-in colors. All of these items are also added post-assembly and painting to the tank, and so I doubt that they would generally be the tank's painted color.

Just some thoughts!

Bob