Just check coupons out (with price alert and history). You probably want to know what is the best price?
Weight: 11.95g, RP-SMA male
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($4.36): BGBCBG10
2. ($4.46): Parts8
3. ($4.51): aff7off
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): rchobbies8, TTxBG10, e2bcea, CFadmitad, f62884, d8f2bb, BGss9%rc, bgssaff9, BGCCOO, BGBCFPV, bgbcfpv
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – DYS FPV 5.8G Antenna SMA male ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for DYS FPV 5.8G Antenna RP-SMA male.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).