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BevFlex-4X Installation Manual Rev 2.23 November 2019
3.
Beverage-On-Ground (“BOG”) or Beverage-In-Sod (“BIS”)
The BOG antenna that is
sometimes referred to as a “snake” antenna is nothing more than a BevFlex-4X installed on or just
under the ground surface. While it might seem counterintuitive to have your receive antenna at or slightly (less than 1 inch)
below ground level, it does work and has some interesting feature differences when compared to an above ground Beverage
installation. The BevFlex-4X installed as a BOG retains the same advantages with respect to the use of RG-6 coax for the
antenna element and feed lines as well as the ability to feed it from any point along its length. In addition, since the velocity
factor of the antenna wire at ground level is much lower than a wire above ground, the overall electrical length of the antenna
is nearly twice as long as the physical length of the antenna. This extended electrical length characteristic, along with the
ability to hide the antenna in sod, can put the advantages of this low noise receiving antenna within reach of those with
limited space or HOA restrictions on antennas.
The BOG installation performance will be close to that shown in Table-2 and Figure-11. One major difference, however, will
be that the overall signal level will be lower than a traditional above ground Beverage antenna. While signal levels from a
BOG will normally be sufficient for lower frequencies below 7 MHz, the use of the BevFlex-4X in a BOG configuration above
7 MHz may require the use of a low noise preamplifier at the output of the switch box.
Table-2
BevFlex-4X Performance Guidelines for
Beverage Antenna On Ground (BOG)
Antenna Length
Overall Performance Vs. Band
Relative Directivity
160m
80m
40m
160m
80m
40m
100 ft.
F
G
G
F
F
G
150 ft.
F
G
G
G
G
G
200 ft.
G
E
E
G
E
E
250 ft.
E
E
E
G
E
G
300 ft.
E
E
E
G
E
G
E=Excellent,
G=Good,
F=Fair, P=Poor,
NIL=Insignificant
Operation at 40m and above
may require a pre-amplifier
