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That's a good deal on that 4 bay. I'm a fan of the bow tie style as they have worked well for me.
If you're good with fabrication you should google Mclapp DB4, he has some plans on his site and if you follow them with decent precision you can build an antenna with as much, (or more), gain as any you could buy.
If I were in your shoes with towers almost 180 degrees opposite of each other I'd try the 4 bay and remove the reflector, aim it about 20 degrees off from the direction of one set of towers. But I'm not a fan of attic mounts, they have never performed at even half of what I expect from my location. I vote for roof top.
With the reflector removed it will receive signals from both front and back of the antenna. With some fine tuning on the aiming you could get channels from both directions. Channel 43, (52.1) is so close and strong you should get it as well.
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