Try a 4bay bowtie/screen antenna pointed in the middle - it can handle a 60 degree span for UHF. Depending on the building materials, the attic might be weakening or bounching the signals severely. Try the antenna outside for comparison. You may have a multipath problem too.
I actually installed a Silver Sensor in attic yesterday . .coupled with a low power amplifier and FM trap and am now getting significantly better results. With the variable gain on the amp, notice better results with less gain used. . .wondering if the "next level" might be enjoyed using a pre-amp instead . . .(such as the ChannelMaster 7777)??
If you are putting it in your attic then the next level might be an 8 bay or 4 bay with a 7777 preamp. The silver is a primo antenna for the set top but if you are in the attic then you can step up to a real antenna that should easily outperform a set top type, then maybe someday you can put it outside and really boost your signal.
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