Your tvfool report assumes an antenna with 0 dB gain outside and in the clear. It doesn't take into consideration building loss for an indoor or attic location, or loss from trees or other buildings in the signal path. The gain of your antenna can be added to the NM figure on your report to make it more positive.
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I posted the 10" AGL for one reason, that being, in reality , the antenna at 10' is picking up channels more like the 35' plot.
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As long as there sufficient signal strength for the tuner to lock on to the signal, you will not see a difference on the screen.
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Does anybody foresee any issues with a coax run of 50 to 70 foot?
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Let the signal strength meter on your TV be your guide. You will soon find out how weak a signal can be and still be received.
For an attic antenna, you can always add a preamp near the antenna or a distribution amp further downstream.