Will it pick up channels if I live more than 40 miles from the towers?

RCA rates it for stations up to 40 miles away. Beyond that, or with hills and buildings in the way, reception gets unreliable and an amplified or outdoor antenna is the better fit.

Does it need power or a separate amplifier?

No. It is a passive antenna, so it needs no outlet or power adapter. That also means it adds no gain to weak signals.

Does it work with a streaming player?

Yes. It feeds local broadcast channels to your TV, and you switch to the streaming player for everything else. RCA markets it as a complement to streaming devices.

The antenna itself with its adjustable dipoles and integrated loop. Check the package for the coaxial cable, since a cable is needed to reach the TV's antenna input.

Does it receive FM radio as well as TV?

Yes. It is built for both FM radio and HDTV, so one unit can serve your TV and a radio.

Will it get 4K channels?

RCA says it receives 4K and 1080 HDTV broadcasts. Whether you see 4K depends on whether a local station broadcasts it and how strong the signal is at your spot.