Dan Andersson wrote:
Ron J wrote:

Hello and greetings all,

I borrowed a field strength measurement equipment from the school lab.
I wanted to measure the the field strength of a low power FM
transmitter. I was told that I need to setup the antenna height
correctly. I didn't think of this. I thought all I need is the proper
antenna length and polarization for measurement. Can anyone give me
some insight regarding using the proper antenna height? Thank you.

So there are no simple answer to your question Ron, not without more
information.
Cheers
Dan / M0DFI

Generally when you place TX and RX antennas above the ground
and you change the height of RX antena, you see the variation of
signal strength. This is due to the ground reflection and we call
it "height pattern." Probably your manual suggests this influence.
How to avoid this? (although both methods do not give rigorous results,)
1. You may take the average of height patten.
2. Make the distance short between the antennas.

Tom/jj3fbs