Yes, an ordinary cable splitter like: RCA DH24SPR Two Way 2.4 Ghz Bi-Di Splitter should be fine. If you have a longer cable run, you may want something with a repeater in it to boost the signal. I've plugged in 2 TVs at a time this way with no problems at all.
I normally goto tvfool.com and use actual address, and it will tell me what channels to expect, with different types of antenna, either indoor or roof or ... It's prediction is very accurate. I will try different location with mohu, and have the tv re-scan and "re-save" the frequency every time. Took 1 hour to find the sweet spot, but well worth it.
A complete Phillips amplified antenna we bought for even less than the price on Amazon does an excellent job on UHF and upper VHF when properly adjusted. Location and orientation are important for any design, but they're especially important for indoors mounting because of signal attenuation and multipath.
I use a splitter with Leaf antenna, one to the actual TV and one goes to my mac hooked up to the TV to broadcast over my home network. There is no noticeable signal quality degradation that i notice but if you are super fixated on that aspect, you may notice a difference. If you're using an antenna though, you should expect a perfect signal anyways so... THe splitter i use is one i had laying around, the cable company installed it a few years ago to split the cable in my house and it works fine for this too. Obviously the split quality will depend on how strong the signal is when it reaches you.
I live in a mountain area of Vermont. This paper thin antenna, did NOT work at all, not even one station came in. I use a regular house top digital hd antenna and get 15 stations. Is there something better out there ?
Use an inline "powered" amplifier to boost the signal. Many have two or more outlets. Radio Shack has them, probably Amazon, Best Buy, eBay, or your local hardware store, will have them too. They're cheap no frills and do the job.
With a high quality 2 way splitter the signal loss will be about -3db (half the signal) at each output. The cheap units may be worse. The use of a RF splitter depends on the signal strength in your area. Also the losses thru a long run of RG6 cable. Should more cost effective to go with two separate antennas.