You would need a specific iPad compatible tuner and its associated app that can use the tuner device for this.
I can only find tuners that have Android apps, so you will need to look for something that works on an iPad.
For example: MyGica USB TV Tuner PT682C - Amazon.com
That one only seems to have an Android app though.
You won't be able to just get a random antenna and a random app and make them play nice together.
Best bet is to start a search in the App Store for a tuner app, and see if their associated tuner box is still available.