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Comparison of 1/4 vs 5/8 radiation patterns
Here is a 3D model view of the radiation patterns of the common 1/4 wave whip compared to the theoretical radiation pattern of a 5/8 wavelength base loaded whip.
Both are simulated over perfect ground... which your fender will is not.
Here is the 4NEC2 code for the 5/8 WL model:
CM Base loaded 5/8 wave vertical whip antenna over a perfect ground plane
CE
SY WR=#14
SY DEL=1.868521 'Element Section Length in Meters
SY COIL=6.125e-7 'Load Inductance, Henrys
GW 1 30 0 0 0 0 0 DEL WR
GE 1
LD 5 0 0 0 1390000 'Stainless Steel
LD 0 1 2 2 0 COIL
GN 1
EK
EX 0 1 1 0 1 0 0
FR 0 0 0 0 100 0
RP 0 285 73 1510 90 0 5 5 0 0
EN
Here is the 4NEC2 code for the 1/4 WL model:
CM Simple quarter wave vertical whip antenna over a perfect ground plane
CE
SY WR=#14
SY DEL=0.755 'Element length in Meters
GW 1 17 0 0 0 0 0 DEL WR
GE 1
LD 5 0 0 0 1390000 'Stainless Steel
GN 1
EK
EX 0 1 1 0 1 0 0
FR 0 0 0 0 100 0
RP 0 285 73 1510 90 0 5 5 0 0
EN
__________________
If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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