Radar phasing

If my picture comes up, on the left you will see two transmitting dipoles. The wavy lines are the signals, and they are out of phase (the peaks are not vertically in line with each other). The dotted line passes through the peaks, and since they are not vertically aligned, the beam is tilted, in this case upwards.
I hope you can see my diagram, otherwise I’ll have to try uploading it some other way!

Just one Valiant, the second prototype WB215 was entered for the race. Long range 1645 Imerial gallon fuel tanks were fitted under each wing and uprated Avons awere installed, along with some navigational equipment changes. This resulted in this aircraft receiving a new Type number, Vickers 709. Mainly because Valiants had not had tropical trials, it was withdrawn by the Air Ministry.
Source: Modern Combat Aircraft 11, Robert Jackson

Kev, I have taken the liberty of tweaking your Heathrow picture a bit and hope that you can see wys at his computer now!

“commonly found”

I can’t find any others anywhere!

google, please can you either give us a picture or a link to one?

Here’s a pic from http://www.duffeyk.fsnet.co.uk/su-30mkk.htm in primer, no horizontal bands at all!

I remember seeing an interview on TV once about display pilot monitoring. Someone being interviewed said that there were monitors among the crowd, not in the tower, and if they saw something about a display that they were not happy with, they could contact the tower immediately by cellphone or walkie-talkie presumably, and order the display to be terminated. If that is true, are these monitors present at all displays? It was something to do with being licensed to fly displays.