Cecil Moore wrote:
Dave wrote:

the 4.5 turns is a choke that cuts off the bottom part of the braid
from the top. the top 80mm and 70mm parts are then just a vertical
dipole with the feedpoint at the spot where the braid stops.

I have a Whip antenna that is supposed to give 3dB "gain" at 915MHz.


Which makes one wonder "3dB 'gain'" over what?

I purchased these a while ago and pulled them apart to see if there was
much involved in making similar units. They stated 3dB but did not
indicate whether it was dBi or dBd.


What are your recommendations for 915MHz omni-directional antenna ?
I want to see what kind of range I can get from a pair of 1 Watt,
spread spectrum data transceivers with oni-directional antenna.


Thanks