[TowerTalk] 80 meter vertical or

[Grant Saviers]

Of course a vertical/L needs radials, so assume you have the space for 
those.  The more separation the better as the tower will load or 
severely interact if resonant on 80m.  There are means to detune the 
tower, see W8JI.  The big yagi top loading will resonate the tower to 
much longer than 90ft.

Then conductive guys if not in insulated segments are a concern for 
other options such an inverted V or delta loop apex up or sloping 
dipoles oriented to use the tower as a "reflector", all of which avoid 
radials.  For the V or loop best to have at least 5ft separation at the 
apex and ends pulled further out based on what I have modeled.

Grant KZ1W

On 8/12/2022 13:22, STEPHEN L SALA wrote:
> i have a rohn 45 up at 90 feet with a force 12 6-el the mag 620.  i was thinking of a 80 meter vertical  60 feet or so in length away from the tower,  a short distance held out there with one of those tower rods. how critical is the wire distance from the tower ?   Do i do a 60 foot +- foot
> quarter wave vertical or an inverted el?  to be coax fed only.
> 
> 73
> Stephen
> K7awb
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