[AFMUG] Antenna side lobes...do they move much?

[Adam Moffett]

My question is about the polar plot for a sector antenna where you see 
tiny lobes coming off it.  Such as in between the rear lobe and the main 
lobe there might be several tiny lobes.  I've always thought RSSI was 
unstable when you hit the sector from a weird direction like that.

If I could see the radiation pattern in realtime would those lobes be 
stationary or would they dance around a little?

I'm just looking for an underlying reason for things I've seen in the 
field, and maybe a real justification to use when I tell people not to 
do that.