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Is there any way to get the output of my distribution amp with a multimeter?
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No, you need a signal level meter that is designed for that job. Some TVs have a relative signal strength meter.
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So I get the antenna back up, crimp a new end on and test with the multimeter. Seems to come up
with a short.
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A test on an antenna or balun matching transformer with an ohmmeter can be misleading.
What looks like a short with the DC test current of an ohmmeter, might be OK for RF.
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So did I just waste a whole lot of time?
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No, you didn't waste a lot of time.
You gave it a good try, but your old antenna is too far gone, and is in very bad condition.
As you said in the title: "Was good, now not so good."
Even if you could figure out how the parts should be connected together, you would still need to drill out
the rusty connections, clean the parts, and replace the screws.
It's time to replace your antenna.
The channels that you want from Columbus are all UHF, so you need to buy a new antenna only for
UHF like the Antennas Direct DB4e.