Interaction with the tower and beam may be changing the real SWR, or
your instrument may be getting more RF from a near by MWBC station and
giving you bad readings when the tower is connected. You may be getting
incorrect readings in both cases due to strong field from MWBC.
>
> I'm trying to set up a 160-m. Inverted L
>
> 1) With the coax braid connected to the tower base which has two 8' ground
> rods: lowest SWR is 3.9 at 1.776 Mhz and Z = 79.
>
> 2) With coax braid only connected to the two radials (and not the tower
> base): lowest SWR is 1.62 at 1.614 Mhz and Z = 81.
>
>
>
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