I am looking for cheapest (up to few hundred USD) and simplest Arduino basic solution to track real-time RFID tags distance (also direction if possible) without additional readers or antennas. Current setup: 1 reader and 3 tags with ability to track within 8 meter distance with 30 cm accuracy. Later I want be able to expand the abilities.
I still had never done hardware development before. Easy setup would be very appreciated.