I bought at Best Buy. This unit:
Link to Best Buy Terk. (Verified the SKU, though at Terk site, they use a different number for what looks like the same antenna.)
Looks like a price increase or I got it on sale for $75. (That was my upper limit to spend - though I would have gone to 79).
They don't list the 'distance' at the Terk site. Always a subject to interpretation of 'quality picture'. Standing up it IS directional. So take the 360 degree lightly. Never tried it lying down a the show. it might be more omnidirectional but I can't help but think it will still have some directional aspect. No flat surface can ever be 360 degree and receive signal equally from all sides. (Just think about the geometry. A cylindrical type - maybe. Rectangular - not likely.)
Outdoor is better, but my challenge is running the cable down from room (or attic) to 1st floor. (2 story house with big pitch to roof.) It does matter how far away broadcast antennas are. Most near me are within 35 miles; a few more at 50 miles. A 35 mile 'mudflap' barely brought in the signals for those at the edge of 35 mile. Terk.com has an antenna finder that will show a map of your area based on your street address. You should get the outdoor antenna high enough to 'look over' the peak.
To get the antenna up, I bought a cheap
floor lamp, (link to Target online) removed the shade and made a shelf from a wooden disk clock face size 8 inch diameter I bought at Michael's (hobby shop). Painted it black to match lamp and gorilla glued it. Antenna is up about 6 foot from floor. (Antenna cable was plenty long enough for this setup. You do need a nearby 120 volt outlet as it is an amplified antenna.) Raising it up made a difference from being set on near by shelf. Allows me to tweak it by a bit of a twist, though I rarely do that.
Spectrum bought TWC. They are one in the same. I'd bet what they are trying to sell you is their package. They may have to honor TWC packages to existing customers. No issue with earthlink. When my bill went up, TWC (at that time) said I had to call Earthlink. Done that twice now. So, working on 3rd year with only internet from Spectrum/TWC.
Good luck. Hope this all helps out (maybe more detail than needed.)