Well, I found a BNC connector, hooked up my antenna, and voila! Before testing it, I tried listening up on my FT-817, and the band seemed pretty dead. But the DC40B had signals!
I can hear a bit of hum, which I suspect will only get better once I use a better power supply (I was just using a wall wart) and get it in its case, and its wide, but you can definitely hear signals. At the end, some QRM comes in and spoils it, but I’m encouraged.
Addendum: My morse is pretty rusty, but the loudest signal at the beginning of the recording is a QSO between K6LQ and W6JHQ. W6JHQ would appear to be about 360 miles away, just west of Victorville.