That should have been more radials DECREASE the bandwidth.
Sorry,

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It may be considered by some that a decrease in bandwidth is a
disadvantage. What really matters is that more radials result in an
improvement in power radiating EFFICIENCY.

Albeit with a diminishing rate of return.

In ordinary garden soil, first lay about 3 or 4 shallow buried radials
and test the results using the receiver S-meter.

Then increase the number of radials by 50 percent and look for an
improvent. If there is no measurable improvement then, to be certain,
increase the number of radials by another 50 percent.

Keep increasing number of radials until there is no improvement and
then do a final increase of 20 or 30 percent. Even with very poor
garden soil, in all probability you will not exceed 20 or 30 radials.

Just ignore the ridiculous instructions in the handbooks and
magazines, and from old-wives, to lay the magic number of 120 radials
at the outset.

Due to reciprocity, any improvement on receive, as indicated by your
S-meter, will be exactly followed by the same improvement on transmit.
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Reg, G4FGQ