Hi Rik, Thank you for collecting and posting this information. The conclusion, therefore, (and for those not having the time to study this) is that at least a moderate loss of signal signal occurs wh
John, G4CNN, did some extensive calculations on drooping toploads (umbrella antennas). A summary of his work and a link to the webpage with all info can be found at : http://www.qsl.net/on7yd/136ant.
To All from PA0SE In order to find the effect of drooping top load wires upon the radiation resistance I modelled an umbrella antenna using K6STI's antenna simulation program Antenna Optimizer. The a