Batboard

We recently noticed a lack of tx coverage on the back side of a large lattice tower.

The tower is a 3 sided tubular steel tower about 5 feet on a side where we are about 100' up.

Our customer has a DB222 antenna stood off about 4' from the tower.

I am wondering if the narrowness of the entire antenna package makes it more susceptible to blocking by the tower.

Would an antenna of this type: http://www.sinclairtechnologies.com/cat ... px?id=1435 get across to the back side any better, or is there any experience with this sort of thing?

I have also considered a transmission line splitter to get an antenna on the other side like a water tank would, but I foresee phasing issues and nulls and the like.

Thanks.

You will always have reflections and attenuation when the tower is larger in width than 1/4 wavelength.
So put the antenna on the side where you need to talkfurthest, then hope for the best, OR
Buiild a new 100 ft tower so that the DB222 antenna can mount at the top without being shadowed by the tower structure in any direction.

You could install a power divider to split the power into 2 equal values. The coax cable that will be needed to feed both antennas has to be cut to close tolerance to match the frequency of use and be exactly the same lengths for both cables.

Mount one antenna off the point of one tower leg and mount the second antenna off the middle of the face on the opposite side of the tower. The tower leg mount will be no problem, but the center face of the other side of the tower will take some skilled design work to get a mount to work. The distance off the tower structure comes into play here and needs to also be calculated.

I would suggest getting the antenna company involved with helping you work through this problem. If one side of the tower needs to cover a greater distance than the other, let the antenna company know this up front before you get very far into this project. You want to do this only one time and not come back to fix a screw up that should have been covered from day one.

This project is not one the average radio tech should take on by them selves. Good luck on your efforts and do let the group on here know how you make out.