You can't compare power directly between VHF+UHF stations. It takes much less power to cover the same area with VHF than is the case with UHF. Also, the longer wavelengths of VHF propagate a little better/easier over terrain, and even the limit of curvature of Earth. I'll get back to this in a little more detail a bit later.
If I recall correctly, I beleive WBNS-DT is at 1MW. They are shown as licensed for 1MW on FCC site, their last STA (granted for 6 months) expired near end of 2002 according to FCC site.
Looks like 1450khz is at about a 256 degree bearing from WCMH-DT --- According to their pattern, that would equate to about a .723 relative field value in your direction ... Not sure, but I think they are using the 288KW ERP STA(you'd get 288 KW erp sent your way if the relative field value was 1.000 in your direction) To calucate ERP sent in 1450khz direction from that ... (.723x.723) x 288,000 watts = 150.5 KW being sent in his direction... So, a bit of a Null, but they don't really have any big nulls, as the pattern isn't all that directional.
On WTTE-DT, I'm guessing(just guessing) they are at 11.2KW ERP STA now. There has been at least one other STA(for 4KW), and maybe another that used to pop up on FCC site for them, but I'm only seeing the 2 1450khz mentioned now. Last summer, I sent them a reception report when I pulled them in via tropo, which was shortly after they moved to antenna on top of the tower from a temporary antenna(the 2.4KW ERP STA) which was barely off the ground, and only a few feet higher Above sea level wise than MY antenna. This is a portion of the reply from one of their engineer's:
"We are making a little more than 4kw now,
it is 8.4 kw now that we've moved to the good transmit antenna. "
As you say WSYX is on VHF at 59KW ERP, which is quite High Powered for DTV on VHF channel 13 - It's the max FCC will let them do presently. 13.7KW ERP is what WCPO-DT is running, that's not low power for VHF either, and generally seems to cover their service area quite well -- It is the Max they'll let WCPO-DT do, my guess is, Co-channel issue with WBNS 10 are probably the biggest reason why they aren't allowed to do more, presently. The absolute Max allowed for DTV on 7-13 is something like 160KW ERP, we won't see much of that until the analogs are shut off, but I think there are a couple of DTV stations in U.S. (out of a little less than a couple hundred with current VHF DTV allocations) which have 160KW ERP CP's.
The Max allowed on UHF for DTV is 1,000KW ERP. Not all stations are allowed to do that much though --because of co-channel/adjacent channel interference issues/etc, and many are running STA's at various power levels to save on utility bills for as long as FCC will let them .. High power UHF transmitters can use over 6 figures in utility bills per year - I don't recall the exact number for Max DTV power allowed for Lo-VHF(2-6), but I think it is something like 50KW, although, no current lo-VHF station I know of is doing more than 7.5KW ERP currently, and there are only a couple low-VHF DTV stations with full power allocations over 10KW ERP ...Again, likely because of Co-channel interference issues with analog stations. The highest power DTV CP in U.S. currrently is 36.4 KW ERP, a station in Lexington, KY(which is actually running a very directional antenna at 7.5KW ERP STA presently).
The DTV max power limits roughly equates(actually, relatively speaking it's "more" power allowed for DTV Maximums than analog - more on this below) to the maximum allowed for analogs -- Which is, 100KW ERP on Low-VHF(there are more "detailed" max power limits depending upon antenna height with low-VHF), 316KW ERP for Vhf-HI(7-13), and 5,000KW ERP for UHF.
Also, DTV ERP is different than NTSC ERP -- NTSC ERP power is expressed in "peak" terms, DTV is average. Also, with DTV ... ~12db less signal is needed to get "good DTV reception" than is the case for a so-called "grade B" analog signal - It was defined by FCC as a 12db difference anyway, and the original Table of allocations for DTV were based on that difference ... They modified that later though, and "upped the power" on the CP's, although, the 12db is pretty accurate -- but of course, getting inside buildings and over terrain with signals rather than to antennas with 10db gain on 30feet antennas outdoors is a little different story ..
I do know I've been very impressed at how well "LP" DTV does. For example - At first, WCET-DT was running a 7KW ERP STA. One of their engineers posted that at that time on the Cincy thread that they were using a 250 Watt Solid State Amp, and add in the antenna gain, and you get 7KW ERP. They moved to their "real" transmitter and a 215KW ERP STA last spring. From 32 miles distant and with some terrain issue involved I had absolutely no problems receiving them at the 7KW ERP, in fact, except for slightly higher signal quality readings, I couldn't tell any difference when they increased power.
OF course, indoor antennas and more severe terrain issues where LP DTV is concerned would likely be a different story -- But still ... In field tests/etc that have been performed that I have seen, getting the transmitting antenna up nice and high often seems to be more important for DTV than running high power levels, since we don't have to look at "snow" ...
Although, again, certianly, Higher power is going to do better when terrain issues(especially fringe areas), and getting into buildings are concerned ...
Where VHF is concerned however ... the longer wavelengths involved can also get around terrain issues(even a little farther beyond curvature of Earth) much moreso than UHF, and of course it takes much less power on VHF to cover the same area as is the case on UHF ... This isn't the best, or most technically accurate explanation, but in the interests of trying to keep this somewhat short: One of the simple reasons for this is, because VHF wavelentghs are longer, The Receiving antenna has to be "bigger" to be resonant and work well on VHF frequencies, so it is easier for more of the signal to "fall on" the antenna. The "bigger" the antenna, the more energy can "fall" on it ....