This is the antenna that Radioddity sells on amazon.
Here is the Nagoya that also works even though it stops at 430Mhz
https://www.amazon.com/Nagoya-NA-771-SMA-Male-15-6-Inch-Antenna/dp/B07RM6PJ62/ref=sr_1_14?dchild=1&keywords=radioddity+sma+antenna&qid=1618111163&sr=8-14
Here is the two pack made by TWAYRDIO
https://www.amazon.com/gp/product/B0721BQRN3/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1
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Just match the connector that is on your radio to the antenna connector.