I put up a third TV antenna recently, using a Hi-VHF/UHF antenna but hoping to receive RF channel 5 as well since it is nearby. It did not get RF 5. The antenna is mounted at the corner of an observation deck where people walk by, it must not project to the rear of its mount. I could not find a lo-VHF antenna that would fit my space requirement.
So I made a cut to length antenna out of two FM dipoles, taped it to a PVC pipe, mounted that on the pole with the Hi-VHF/UHF antenna, and combined them with a two set coupler.
I now get very good signal on RF 5 KVCR 24.x with 4 PBS channels for my DVRs.