Is there a router I can use or some other type of item that will work
If you're talking about 4G (LTE) or 5G (NR) radio based broadband, from people such as EE and Three, they will normally supply what looks like a typical home router, and the external antenna is optional - but depending upon your location might be needed to get a signal.
If you have a property that is tall (e.g. 3 story town house) or you live in a tall block of flats, or even just upstairs in a typical 2 story house, you might find just putting the router in a window is all you need.
But without an approximate location, rural, or not, its only guesswork.
23 years of broadband connectivity since 1999 trial - Live BQM