Two kinds of RP-SMA dual-band WiFi antenna parts having :
- Y9MPH is an omnidirectional dipole stick antenna which most use
- 3TJ9N is a semidirectional patch/panel antenna on a wire which few people use but can be useful when you want to put the antenna into a place having better signal reception
Both are also supposed to work for Dell OptiPlex Micro models 3020/3040/3050/5020/5040/5050/7020/7040/7050 (as 5030/7030 models were never released and 3030/9030 only released as a different all-in-one PC form factor): basically the end of the Micro form factors in Dell OptiPlex Series 4 and start of Dell OptiPlex Series 5.
Links (some also containing part numbers for other related components like internal wiring and M.2 Wi-Fi cards):





