In the General Wireless forum is a topic called: "1250 802.11n Brdiging" where it was suggested that a user bridge with 5ghz Yagi Antennas and then it was mentioned potentially getting a convertor for the rp-tnc so that alternate antennas could be attached.
As far as I know (speaking about US FCC) it is illegal to install an antenna that is not certified for the radio by the manfucacturer/FCC. I believe the is why there is a unique connector requirement in the first place.
Anyhow, upon further reading, it looks like the "law" was modified so that you could attach any antenna of equal type (Patch=Patch, Yagi=Yagi) as long as it had equal or less gain.
Now, my first question is this:
Do you think you could add a connector converter to attach a non RP-TNC antenna to an RP-TNC device? Does the unique connector rule apply at the antenna level or the radio? It would seem to me that the antenna would need to be manufactured with the unique connector and that one could not simply convert the antenna at will.
As I investigated a little further, the bigger problem actually may not be the conversion of the antenna but the attachment of a Yagi to a 1250. The only antennas listed in the 1250 Section of Cisco's Aironet Antenna list are Patch and Omni antennas. This would suggest that Yagi's are not certified with this system and therefor could not be attached to the system even if it had the correct connector.
What are your thoughts on this? Obviously it can be done, but from a "Professional" perspective, at what point is it illegal?