Test / measure free line of sight in city ?

Question

I want to make a connection between two buildings some 1.5 km apart in a city.

There is no free line of sight.

But maybe with two poles of 5 meter on each rooftop high it might work.

But you can't climb in a pole - and spending time creating the whole network just to find out it has no connection is a waste.

Is there a simple (electonic) test / trick to test if the top of the two poles can 'see' eachother?

Thanks for any help.

Dana · Accepted Answer

A bright light source on one building, and a mirror on the other. There are also toners that microwave radio installers use. Basically low cost transmitter and receiver that gives a tone for received signal strength.

FCM Wiesmans · Answer