Strong, line-of-sight high-vhf signal - I'd say any cheap indoor (unpowered) antenna with VHF dipole elements would work, but the Terk has the added benefit of being quite directional for UHF stations, which can aid in knocking down multipath problems on those channels.
But since she watches the only VHF station in the green, I would think any non-powered indoor with a real VHF dipole would be enough. I used the Radio Shack indoor for a while, until I got an outdoor (mounted in the attic) to get the more difficult distant stations I wanted, but I still use a telescopic dipole from an old portable TV for the VHF stations.
Just tossing it out there. Wait for the experts to chime in before buying.
Terk indoor antenna
Cheap Radio Shack indoor antenna