Or is this impossible?
I'm unsure what you mean by "directly." Most passive ultrahigh-frequency (UHF) readers provide a received signal strength indicator (RSSI), enabling users to estimate a tag's relative distance to a reader. To my knowledge, however, most do not provide information about the signal's angle of arrival. If any reader manufacturers do provide information regarding the angle of arrival, they are invited to post information below.
—Mark Roberti, Founder and Editor, RFID Journal
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