$16.59 – Donut Loop Broadband Antenna Frequency Range 10kHz-180MHz with Low Impedance Converter.
According to my DB the lowest price is $16.59 for Donut Loop Broadband Antenna 10kHz-180MHz (in Banggood). Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Latest coupon code price check (UTC time):
Banggood ($16.59)
Banggood warehouse is located in China. Hmmm… There is no active coupon in Banggood at this moment. Is it a low price? From what I can see this price is higher than average price ($15.29).
Link: Banggood product page
Price: $16.59
Additional Banggood coupons: first page and second page
Aliexpress
There’re some similar (or not) items on Aliexpress
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Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for Donut Loop Broadband Antenna 10kHz-180MHz. The lowest price was: $14.99.
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)).