So FOUR Networks are carried on the TWO Strong stations on Ch27 and Ch30, which have NM greater than 50 dB...which means an INDOOR Antenna will "probably" work just fine....and in the Attic would be even better.
Since you ONLY need UHF for the Major Networks (Hi-VHF would be needed for Ch8 & Ch11), pretty much any of the better NON-AMPLIFIED Indoor Antennas mentioned in the fol. thread should work, including Mohu Leaf, Winegard FlatTenna, WallTenna and other various "Flat" Panel Antennas. Old Fashion VHF-Rabbit-Ears+UHF-Loop has lower UHF Gain, but MIGHT work, and would be better choice for Ch8/11:
Eagle-Aspen 2-Bay Bowtie with Screen Reflector is NOT Optimized for the NEW UHF Band (Ch14-52)...it appears to be the same size as the OLD DB-2, which seems designed for the REALLY OLD UHF Band (Ch14-80+) that was recently cut back to 800 MHz Max (our old Ch69) in Europe....so it's TWO Generations out of date. Nonetheless, it's about the least expensive Antenna (esp. OUTDOOR) you can get your hands on and although not IDEAL, it still has usable Gain in UHF Band, but is very poor for Hi-VHF with more Gain to the REAR. BTW: NONE of those FLAT Indoor Antennas is Optimized for New UHF Band either...and NONE are designed for Hi-VHF Band, so you get what you get. However with the Reflector, the Eagle-Aspen probably has 3 dB higher Gain than any of them....if you can find a place indoors for it....and MUCH BETTER if Outdoors ("typically" 13 dB +/- 7 dB higher signal levels Outdoors than Indoors...on the Average....YMMV).
OTOH, I recently uploaded Analysis and Dimensions for H2 (11x12) DIY Project, a 2-Bay Bowtie (NO Reflector) OPTIMIZED for Ch14-51 with significant Ch7-13 Gain but Excessive SWR in that Band, which runs circles around ANY of the above as well as DIY or Commercial 2-Bays and is VERY SIMPLE to build with either Wire or Metal Foil or Aluminized Tape on a Clear Plastic Sheet or Posterboard....and can be hung on the wall, HIDDEN behind a Poster or photo collage:
And here is Re-Optimized H2 (9.5x12) with 24"x24" Screen Reflector (36"x36") in process...will upload soonish:
I also uploaded Analysis and Dimensions for RLH2 DIY Project, a 2-Bay Bowtie (12x10) with a Rectangular Loop Hi-VHF Resonator (NO Reflector), which is OPTIMIZED for Ch14-51 as well as Ch7-13 Hi-VHF Band...with ACCEPTABLE SWR: [See Option "c", which is compared to M2 versions "a" and "b")
The 80-degree Hi-VHF Beamwidth for either of these DIY Projects can facilitate reception of BOTH Ch8 and Ch11, which have 82-degrees Angular Separation. It is also possible to add a Reflector to improve UHF and Hi-VHF Gain and SWR. I'll be adding Fully Re-Optimized versions in the near future....or simply add a Screen Reflector at about 4.5 to 5.5 inches away from the Bowties. Optimum Reflector Size for Hi-VHF performance is 32x32-in or even better 36x36-in, where smaller sizes result in lower UHF Gain and eventually Hi-VHF Gain moves around to the REAR (see my studies for M4 with different sizes of FLAT Screen Reflectors).