... or even since their founding? (I'm not concerned with minor changes or "tweaks", as long as the basic logo is recognizable as not having changed materially.)
The first one that comes to mind is the ABC O&O "Circle 7" logo. I know there are variants throughout the country, but I am thinking of the logo for WABC, WLS, and so on:

I know that in the beginning, ABC was trying to snap up the channel 7 allocations in various large cities, the idea being that low-VHF might go away, and (assuming the channels weren't renumbered) this would put ABC at the top of the dial. There's also somewhat of a parallel there with how the major Australian TV networks brand themselves, Seven, Nine, and Ten. (I'm assuming that, wherever possible, they got these OTA channel numbers, Sydney, Melbourne, et al).
I know that WCSC-5 in Charleston SC had a very simple, elegant logo for the longest time, but a few years back, they changed it to a squashed-down "5" that, compared to the former logo, is kind of ugly. Here's the former logo I'm talking about:

The first one that comes to mind is the ABC O&O "Circle 7" logo. I know there are variants throughout the country, but I am thinking of the logo for WABC, WLS, and so on:

I know that in the beginning, ABC was trying to snap up the channel 7 allocations in various large cities, the idea being that low-VHF might go away, and (assuming the channels weren't renumbered) this would put ABC at the top of the dial. There's also somewhat of a parallel there with how the major Australian TV networks brand themselves, Seven, Nine, and Ten. (I'm assuming that, wherever possible, they got these OTA channel numbers, Sydney, Melbourne, et al).
I know that WCSC-5 in Charleston SC had a very simple, elegant logo for the longest time, but a few years back, they changed it to a squashed-down "5" that, compared to the former logo, is kind of ugly. Here's the former logo I'm talking about:














