Tower stand off mount

[edfiero]

I'd like to use a stand off mount on the side of my tower to install a small 2 meter/70 cm vertical antenna.

Is there any minimum distance the mount should stand off from the tower to avoid interference and messing up the SWR too much? Is 3 feet enough or does it have to be more?

Thanks

 

[BJ radionut]

Antenna Standoff Arm (kf7p.com)
Look like his are 3 ft long...


I always allowed full Half wave on lowest band...which low 144 megs around 39-40 inches

 

[Blackcat630]

A couple of my homebrews.. Angle iron, spare mast, U bolts..

 

[edfiero]

A couple of my homebrews.. Angle iron, spare mast, U bolts..

View attachment 41817

Thanks. I was thinking of doing something similar....homebrew. How far do they stick out from the tower????

 

[Blackcat630]

Thanks. I was thinking of doing something similar....homebrew. How far do they stick out from the tower????

The discone is on 4 ft angle iron and the tri band vertical if I remember correctly is on 6ft. You can also use aluminum angle if your load is an issue.. its also lighter to hall up and mount. I used 6ft on the vertical to get out as far as possible to avoid interaction with the tower. It seems to work fine with minimal nulls.