Radio Shack DX-350 portable multi-band receiver.
The thing was deaf as a freaking post, and it's a wonder that it didn't kill my interest in radio altogether. On an exceptionally good night, it might have received one of the religious super-stations, possibly an international news broadcast, and maybe a single-letter beacon or two.
I guess I'm a slow learner or something, because I kept reading stories and reports of what was out there to be heard, despite not actually being able to hear them on that little plastic brick, and I eventually got a better radio (which actually _could_ receive signals). The Yaesu FRG-100 was my next foray into radio, and it heard a pretty good assortment of things. Its biggest failing was in the design; lacking a keypad, or anything other than the knob and a couple of buttons for frequency selection, traversing the bands took a while. There was software out there that could control it, but I could never find/afford it, and my computer at the time threw off so much RFI that I'd never be able to use the two of them together anyway.
It wasn't until I upgraded to an actual HF transceiver that I really became able to listen to the bands with any real ease. My IC-718 remains my rig of choice for listening, and if I want to transmit, I just punch in a frequency, tune it up, and go.
EDIT to add: Oh, RIGHT! Now I remember what kept my interest going...
In between the DX-350 and the FRG-100, I read an article on modifying a Radio Shack AM Flavoradio for shortwave reception, by replacing the ferrite loopstick with a multi-tapped coil. That little flavoradio conversion had exceptionally touchy tuning, but by cranking the switch and finessing the tuning knob, it actually picked up a better selection than the DX-350 ever did.