I've constructed a 144/440 Dual band Open Stub J-Pole Antenna. I saw the plans for this on the internet (link to plan… | Antenne, Radioamatori, Circuito elettronico
High Gain Dual-Band 2m/440 Handheld Reverse SMA Antenna | Powerwerx
A dual-band MTM-inspired small antenna. (a) Geometry (the ground plane... | Download Scientific Diagram
Antenna Dual-band Outdoor Omni Fiberglas 2.4GHz 5dBi + 5GHz 9dBi
CHAMELEON ANTENNA DBVHF-UHF CHAMELEON ANTENNA CHA Dual Band VHF/UHF Mobile Antennas | DX Engineering
Amazon.com: Mobile Radio Antenna Dual Band VHF/UHF 136-174MHz/400-470MHz and PL259 Male Connector Magnetic Mount Base for Vehicle Ham Radio Car Truck Amateur Radio NL-R2 : Electronics