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I concur with Tigmr's position that an attic installation for this level of signal is may not work. I'll go one step further, at best you'll be prone to break up and drop outs.
The issue is that with attic installations, plentiful signal is required to have a high likelihood of success. This is something you don't have. The translators at magnetic 122 are low power (100 watts) and asking them when at approximately 20db signal strength to penetrate your roof with enough signal to be decoded is a tall order.
Generally, when your desired signals start to fall below 25db signal strength outdoor installation is the only way to go. With an attic installation you are introducing a solid object that a broadcast signal must pass through. When signals are weak to begin with, then making them go through a solid object comprises them to where even a strong antenna like a Antennas Direct DB8e may not be able to capture enough signal to provide reliable viewing. You can go ahead with an attic installation, but be very aware that chances of drop outs and or no decoding at all for some of these translators is a very real possibility. The attic installation you seek will gut a large amount of available signal.
If I were installing here, I'd go with a robust set up in a outdoor configuration. An Antennas Direct DB8e with the RCA TVAMP1R preamp feeling your coax down to a non-amplified splitter.
Sometimes folks like to "hide" antennas for aesthetics. In strong signal areas, you can get away with this. In your situation, I would not advise even attempting an attic install. Installing outdoors a DB8e orientated to magnetic 122 with the setup mentioned above gives you an excellent chance at successful and reliable reception.
Cheers.
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