I would say that the day signal is much better. On a clear day you can now hear it on the freeway in Tulsa. As you drive into Oklahoma, 570, 660, and 820 used to be basically equal. Not anymore - 570 is better. Of course, 620 is still king of the DFW am's in Oklahoma.
Growing up mostly in Tulsa, I always found 820 was the best signal with 1080 close behind. They were strong enough to overcome the alternator noise of your car while the others generally weren’t. You could hear those other stations there, but they were noisy. 820 was also the only signal you could hear there after dark, and you could hear it on most anything once the skywave signal kicked in. The others were gone as soon as their nighttime patterns went on.
I was gone by the time KWFT 620 moved and became KAAM, but I do remember it sounding decently when visiting family there.
Of course, the better question today is why you would want to listen to those stations at all in Tulsa. Few of them offer anything you can’t already get there. I could see it if you had relatives in DFW and wanted to hear what was going on in bad weather, but, today, you have better options than radio for listening to them.
In the late 80’s/early 90’s, you could get a handful of DFW FM's in Tulsa with a decent radio and antenna. I could listen to KDGE on the stereo in my bedroom until the 94.5 in Locust Grove signed on. Prior to KOKL-FM moving to 94.1 and becoming KTHK, KLTY was almost always there, and KMEZ was available before the 107.5 in Grand Lake signed on. KVIL and KHYI/KODZ were frequent but unreliable catches there, too. KNUE from Tyler was a regular after KTXR in Springfield, MO got moved to 101.3. Today, there are too many stations in and around Tulsa to get any of them.