Cisco Aironet Omnidirectional Antenna

so i've got another cisco antenna first to take a look at i picked this up pretty cheap i think i paid six pounds for this uh it's not new it's not new old stock it's been used but it's in pretty good condition uh it's the uh air and t 2506 we've had a look at a similar one to this previously on this channel which was a ceiling fan and that had a pretty unique um uh element in it it wasn't as uh you know as a straightforward design as what we thought in fact let me just get that so this is it this is from the cisco ceiling fan and uh basically it's it's a herzian dipole it's uh the five dvd version of the hertzian dipole we've got a quarter wavelength here quarter wavelength here loading coil as a separator and then i think i measured this at the time i think it's a half wavelength or maybe just a little bit more but it's unusual because it's got this shape here and that was to do with