The Atari 800 had a nice range of output sockets: four joystick ports at the front:
Along the right hand side, a serial interface (SIO) port, an S-video type output, and a power jack socket:
However, at the rear there was a (rather daft) flying RF lead for connection to a TV.
The case included a heavy duty cable relief design for this cable, comprised of four sturdy lugs, built into the heavy cast aluminium RF shield (image from Troubleshooting the beautiful Atari 800 at 23:58):
Note that none of the RF circuitry on the motherboard is actually contained within the RF shield, with the RF modulator box and the cable going to the onboard RF socket placed to the right of the RF shield, as this photo shows (taken from the same video at 22:30):
Why was a standard RF socket not used instead? Why wasn't it obvious to the designers that this ugly "tail" rather ruined the aesthetic of the whole machine. It surely wasn't a cost cutting exercise as the Atari 800 was one of the more pricey machines at that time.
It might be worth noting that there was a "hidden" edge connector at the rear of the motherboard - that wasn't provided an opening in the case - which is only revealed once the RF shield is removed. This edge connector is in roughly the same location as the flying RF lead egress, so maybe it had something to do with that? From the video at 27:30: