NooElec SKU100692. The first premium RTL-SDR antenna bundle! Perfect for all SMA-input SDRs like our NESDR SMArt series and HackRF One software defined radios. The antenna cable leading from the antenna base is 2m of high-quality RG-58 with a male SMA connector on the end--it is long enough for most remote SDR applications, has much lower loss than other antenna cables in this price range, and makes connectivity to SMA-input SDRs a snap!
eBay