Channel Master Stereo Probe-9 Specs.
Model 3025 - Previously Model 4408

The Channel Master Probe-9 (model 3025) was a workhorse. It wasone of the most popular FM antennas in use today by FM Dxers and audiophiles. Gain is good, directivity and front-to-back ratio are good.  THIS ANTENNA IS NO LONGER BEING MANUFACTURED.

The antenna consists of four folded dipoles (d1 through d4) which are all driven. In front of the dipoles are 5 directors (1-5). Note that there is no reflector as such. The last dipole acts as a reflector. Each dipole is tuned to a specific portion of the FM band.

Spacing between each director is 15 inches (38.2cm). Spacing between dipoles is 20 inches, or 50.8cm.

Total Length of All Elements

	Total Length tip-to-tip
Director 1	48 inches/ 122cm
Director 2	49 inches/ 125cm
Director 3	49 inches
Director 4	49 inches
Director 5	50 inches/ 127.5cm
Dipole d1	54 inches/ 138cm
Dipole d2	63 infhes/ 160cm
Dipole d3	68 inches/ 173cm
Dipole d4	74 inches/ 189cm

Notice that dipoles d1 and d4 are connected on the bottom of the dipoles, while dipoles d2 and d3 are connected on both the tops and bottoms of the dipoles and that the connections do not cross as on the Finco design.

Total length of the 3025 boom is about 137 inches, allowing an inch or so extra on each end. The connection to your lead/balun is at the bottom of dipole d1.

Please use this information for comparison purposes only.

Additional Information:
Note on dipole connections: To connect the dipoles, Channel Master used the same
gauge tubing as their antenna elements (3/8 inch). Connections from d4 to d3 are from the bottom
of the dipoles. Connections from d3 to d2 are from the TOP of the dipoles and
connections from d2 to d1 are from the bottoms of the dipoles. Dipoles d3 and d2 have
both bottom and top connections. All dipoles are completely insulated from the mast
and all connections run parallel to each other (they do NOT cross). Directors are NOT insulated
from the mast.

Check out the Finco design by clicking here.

Created on September 17, 2000
Updated on October 20, 2004