Amazon.com: MLA-30+ Loop Antenna, 100kHz-30MHz Active Receiving Antenna, Rainproof Loop Antenna for HA SDR Short Medium Wave Radio, with 10m Feeder,Built-in Low Noise Amplifier,for Rooftop,Balcony : Electronics
Building an active wideband antenna for your SDR
Simple Active antenna in SW/MW/FM bands - ElecCircuit
Low Freq. Antennas
Scanner Receiving Antenna - MFJ-1022 HF Active - (300kHz To 200MHz) | eBay
Active HF Customizable Loop Antenna for Portable Scanner Radio Receiver | eBay
All Band Active Antenna: HF, VHF, Uhf | PDF
Scanning/Receiving Antennas | Moonraker
Cross Country Wireless Active Antenna
Amazon.com: Scanner SDR Antenna Tripod Portable Collapsible by Super Antenna SR1 UHF VHF broadband : Electronics
WAN-97A Active Nomad Base Antenna | Scanner Master
Active HF Customizable Loop Antenna for Portable Scanner Radio Receiver | eBay
Amazon.com: Bingfu VHF UHF Ham Radio Police Scanner Antenna Amateur Radio Mobile Radio Scanner Antenna Magnetic Base BNC Male Antenna Compatible with Uniden Bearcat Whistler Radio Shack Police Scanner Ham Radio :
actice loop hf antenna AL250W
Active Antenna AA-7 HF/VHF/UHF, 3-3000MHz
Multicouplers
Tecsun AN-48X Indoor Active Loop AM/LW/SW Radio Antenna - Main Trading Company
TECHOMAN Scanner Radio Antenna SG-M507 VHF/UHF + Magnetic Mount – Techoman Electronics Ltd