DealFisher via Amazon offers the refurbished Mohu Leaf Indoor HDTV Antenna, model no. MH-ANT-1000, for $19.99 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, it adds $6.83.) That's $5 under our April mention and tied with the lowest total price we've seen for a refurb. (It's also $20 under the best price we could find for a new one today.) This thin, omni-directional antenna can be hung behind a picture or bookcase.
Note, a 90-day Mohu warranty applies.