This is a dipole antenna system designed by a former FCC engineer at the FCC Lab for compliance measurements. Easy to construct using stuff from Rat Shack, Home Depot, etc.
http://dashfoundation.com/Archives/Roberts%20-%20FCC%20Antennas.pdf
Robert, your "Roll Your Own Dipole" comes at the right time for me because I'm planning to build a horizontally polarized indoor dipole for the C.Crane FM, being used as a STL (Studio Transmitter Link) between rooms, to get the audio out to the AMT5000 AM transmitter.
True, the particular paper linked above specifies use with a calibration meter, but we all know that antenna technology is equally applicable to any use, including transmission.
When the rule thumpers claim that my modification will invalidate the FCC certification applying to the C.Crane FM transmitter, they will be incorrect, because the certification only exists to allow manufacture and sale of the device, and does not provide any sort of special authority or obligation to the end user.
The end users of FM transmitters are bound only by 15.239.
15.21 Information to user.
The users manual or instruction manual for an intentional or unintentional radiator shall caution the user that changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. In cases where the manual is provided only in a form other than paper, such as on a computer disk or over the Internet, the information required by this section may be included in the manual in that alternative form, provided the user can reasonably be expected to have the capability to access information in that form.
Thank you John WDCX and by the way I see it was you who posted the link to the Dipole Paper, thank you for doing that.
AND your mention of 15.21 is definitely germaine, that is to say, relevant to the matter of altering a certified intentional radiator, and no doubt I overlooked the connection, so a second thanks to you.
Fortunately for my reading of 15.21 I may still be safe because it says "COULD VOID THE USER'S AUTHORITY," and not "will void the users authority."
Subject to further comment, my take is that 15.239 is the final point of responsibility for compliance with FM Part 15.
You may be the grinch but I am the crank.