Frank,

IIRC - The LF Engineering H-800 Skymatch Active Antenna
has a PVC Pipe Body and a Second Rubberize 4"-6" Sleave
at the bottom of the Active Antenna Element for Mounting.
* Therefore the Antenna itself is not directly grounded and
receives it's Grounding from/via the Coax Cable's outer-shield.
* This is why the use of a piece of PVC Pipe is an OK Idea
for a short Mast with the H800/H900 Antennas. Where-as
with most Active Antennas a well Grounded Metal Mast is
the preferred method of Mounting and Rigging the Antenna.
* Should RFI / EMF {Man-Made-Noise} be a problem with
the LF Engineering H-800 Skymatch Active Antenna : Then
running a separate Ground Wire up to the BNC Connector
at the bottom-end of the Active Antenna Element and using
a Hose Clamp to secure the Ground Wire to the outer-ring
of the BNC Connector -may- help in Noise Reduction.

hope this helps - iane ~ RHF