Mid range RFID Reader with Anticolision?

Projects General Guidance
1

Hello,
I am trying to find a passive rfid reader with tags that work with arduino. My only specifications are that it should be able to read multiple tags at a time up to about 6-8 inches.
I have tried mfrc522 with arduino unos and megas but the range is too short.
I do not seem to find any PN5180 in stock which can arrive within a week or two (I live in Alpharetta, GA in the US).

If there are any other readers available online, antennas i could attach to the rc522, or pn5180 available where I could get them within a week or two it would be great.

Thanks,
Maanit

2

Use the magnifier symbol up to the right and search for Arduino + rfid. There are plenty of relevant topics there.
https://www.google.com/search?ie=UTF-8&oe=UTF-8&q=Arduino+%2B+rfid&domains=https%3A%2F%2Fforum.arduino.cc&sitesearch=https%3A%2F%2Fforum.arduino.cc