When I use my laptop, connected via HDMI, PIP works.
The PIP material is always what the tuner sees , which in my case, I receive OTA via an antenna.
You can watch a program whose signal has passed through the TV’s tuner and watch one external video source simultaneously. For example, if you have a cable box connected to the Cable In jack, you can use PIP to watch programs from the cable box and watch a movie from a Blu-ray player attached to the HDMI In jack. The picture from the external video source (e.g. Component, HDMI, PC) will be in the main screen and the picture from the TV’s tuner will be in the PIP sub-picture window.
When you do a channel scan, it can be for Air (antenna), or Cable, or both. Although there are no longer any analog broadcasters in my area, the scan looked for both digital and analog stations. Once scanned, you can select Air or Cable in the PIP menu as the source and select a channel. Additionally, within this menu, you can choose to listen to the sound from the Main picture or the Sub picture, PIP window location and/or size.
With the DISH receiver on, you should be able to find the channel it modulates to.
While the UN22D5000 only has one F connector, many satellite receivers also have built-in OTA tuners, to which you can connect your antenna. If not, you will either need to add a A/B switch or 2 way splitter (combines 2 ports into 1) to the single F connector.
For those that have cable, the UN22D5000 has a QAM tuner and will receive cable without a set top box (as required by the FCC, including HD broadcasters in your area, even if you have not subscribed to the cable providers HD service).