I liked the explanation of the Doppler effect's effect on radio freqeuencies. At 33:30, it was mentioned that at the speeds that satellites travel, the Doppler effect is noticeable, so much that you may have to adjust your RX frequency. And at the speed of car travel, which is very slow compared to RF propagation that the Doppler shift wouldn't play a role.

I just have one nitpick, which that at car speeds, a measurable Doppler shift of RF signals indeed happens, even at GHz frequencies, and this is exactly how police radar works (commonly using RADAR way up in the 10 GHz or 24 GHz bands).  This is totally a nitpick, since we're probably not talking about a shift of more than a few kHz, and very few if any radios can tune in less than 10 kHz increments in UHF anyway.

Enjoyed the show. Cheers.