That should really depend on what you paid for it
Easy ~$50
RDV4 ~$300
so i actually detached the antenna from the easy and attached it with some wires so i didn’t have to hold the whole dam thing you position it as you can see it worked for positioning but i get this with a trace
[usb] pm3 → lf t55xx trace
[-] 
The modulation is most likely wrong since the ACL is not 0xE0.
[usb] pm3 → lf t55xx trace
[-] The modulation is most likely wrong since the ACL is not 0xE0.
[usb] pm3 → lf config
[usb] pm3 →
[#] LF Sampling config
[#] [q] divisor…95 ( 125.00 kHz )
[#] [b] bits per sample…8
[#] [d] decimation…1
[#] [a] averaging…No
[#] [t] trigger threshold…0
[#] [s] samples to skip…0
[#] LF Sampling Stack
[#] Max stack usage…5508 / 8480 bytes
[usb] pm3 → lf t55xx trace
[-] The modulation is most likely wrong since the ACL is not 0xE0.
[usb] pm3 → lf t55xx trace
[-] The modulation is most likely wrong since the ACL is not 0xE0.
[usb] pm3 → lf t55xx trace
[-] The modulation is most likely wrong since the ACL is not 0xE0.
i found that out after words thus the disappointment