That's a good one! You're a man after my heart!
First off: Wirelessly? You are dealing with wireless frequencies already--VHF/UHF. Since you can't run RG6 coax throughout, put another HD broadcast tuner box in the attic with your antenna with an RF remote control, and add a wireless video baseband(component video & audio) wireless transmitter/amplifier onto that.
Otherwise, you're taking about an antenna repeater-- if there is such a thing for this.