Re: Ground plane required on a fiberglass boat?
Most mobile antennas do not require a ground plane.
All you're gonna need is a No-Ground Plane antenna kit (Firestick makes good ones, as does Wilson). Motorhomes, boats, most 18-wheelers, they don't have metal bodies anymore, and No-Ground Plane antennas work well
Do J-Pole antennas need to be grounded? | KB9VBR J-Pole Antennas
J-Pole antennas are half wave antennas by design. Actually they are a half wave antenna sitting on top of a quarter wave matching section. One great advantage of a half wave antenna that it doesn’t require any special grounding or a ground plane to operate. That’s why you’ll find half wave antennas mounted in difficult antenna situations, like on a boat or a vehicle roof made out of fiberglass.
As for the second half of the question: yes the J-Pole should be grounded. But instead of an RF ground, the antenna should have an electrical ground to protect it in case of a lightning strike. An electrical ground doesn’t enhance the RF radiation of the antenna, but it is an important safety feature on any installation. A simple electrical ground would consist of a ground line from the antenna either bonded to the tower system or run to a buried ground rod.
The lack of a groundplane makes it easy to mount this antenna just about anywhere. You could put it in your attic, on a chimney or a temporary mast. In fact the lack of a groundplane makes the J-Pole a great choice as an emergency or field antenna since there is less parts you need to assemble in deploying the antenna.
