There are numerous internet sites with antenna reviews to help you pick the one you want. Get one with a gain amplifier..or preamp. I also cut the landline about 5 weeks ago and am now on smartphone only for telephone and internet service (just 3G at present). The phone is $35/mo with unlimited text and data/internet and no commitment plan (Virgin Mobile using SPRINT network). Multiple TVs on a digi antenna are no problem..although if the TVs are all set to the same channel and running at the same time, signal strength could be affected.
"The Universe is comprised mainly of two things.. hydrogen and ignorance."
Inventor, astronomer and metaphysical thinker.