Frequently changing channels with Time Capsule

Utterly stumped by this situation. In our household, we have an iMac, MacBook, and MacBook Pro. The Time Capsule sits on the top floor, maybe thirty feet from the iMac, but in another room; the laptops, obviously, roam the house. There is never any problem with network speed or backups with the laptops no matter where they are, but backing up the iMac is inconsistent. What I've found is that I have to change the channel on the Time Capsule each day—4, 6, and 8 work best—or else the iMac won't back up faithfully. It'll get hung up calculating changes or even find the back-up volume. Stopping the back-up once it gets hung up is a dicey venture. It's a complete crapshoot whether it'll stop. I've done all the usuals—deleting preferences, resetting the Time Capsule—but to no avail.
Any thoughts as to what might be the problem?

Dr. Medulla wrote:
If Ethernet isn't an option for you, is there any way you can move your Time Capsule closer to the middle of the house?
No, there's only one available outlet for the modem. I might be able to move it eight feet closer, but that's about it.
Depending on the exact details of the room with the modem, you might be able to run a cable some feet from the wall outlet to the modem, then an Ethernet cable some additional feet to your Time Capsule. It might help if you could move the Time Capsule far enough to cross over a wall in the floor below.
Curious that you say that those are marginal rates as the MacBook's speeds are fine. Even the iMac runs along well—once the channel has been changed for the day.
Perhaps I overstated the case by referring to that as a very marginal value. All I know is that a signal value of -75 and a noise value of -92 to a white MacBook gave me an AirPort connection that was slower than I wanted to tolerate.
Looking at the running graph in Advanced > Wireless Clients, the Macbook has a fairly straight line, with only a couple bumps, whereas the iMac is nothing but peaks and valleys, so the iMac is definitely struggling to maintain a consistent signal.
If you turn the iMac or move it around the room does the situation change?

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