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www.CorwinWmC.com/electrical/rolls.txt  

title: legal unlicensed use of licensed equipmant

At https://www.ourladyofhumility.org/ on Wadsworth Road they are using a
https://rolls.com/product/HR70 ($170 to $200) to broadcast their services to 
listeners in the parking lot with Low power on 93.5MHz as allowed.
Unlicensed 250 µV/meter @ 3 meters is allowed with licensed equipment.
They usa a 75 Ohm RG-59/U cable to the antenna with a BNC connector.
The unit has typical RCA or phono connectors as well as the less prevalent
External Line Return or the Mini XLR Connector (used on smaller equipment).
I have not determined if it is the standard XLR or the mini.  However,
the outside diameter of the barrel is 5/8"=16mm

They bought the unit from https://www.musiccenterinc.com/ on Green Bay
in Kenosha.  They can supply Radial(sic) or Rolls devices.

other options: 
https://www.adafruit.com/product/1958
  Adafruit Stereo FM Transmitter with RDS/RBDS Breakout - Si4713
  PRODUCT ID: 1958   $19.95 
  transmit audio up to about 10 meters / 30 feet away
  your favorite microcontroller (we suggest an Arduino) to the I2C data lines

http://www.theradiosource.com/products/part-15.htm
    FCC Rules Part 15.221 allow the use of a transmitter without a license, 
      as long as the signal coverage extends only to your property. 
https://en.wikipedia.org/wiki/FM_transmitter_(personal_device)
   Part 15 of the U.S. Federal Communications Commission rules specifies that 
   no license is needed if FM transmitters' 
   Maximum Effective Radiated Power (ERP) of 0.01 microwatts.
https://www.fcc.gov/media/radio/low-power-radio-general-information
https://www.fcc.gov/consumers/guides/low-power-fm-lpfm-radio
https://en.wikipedia.org/wiki/Low-power_broadcasting#United_States

https://www.radioworld.com/news-and-business/news-makers/low-power-radio-faqs
https://www.hobbybroadcaster.net/resources/Part-15-transmitters.php
  Certified Part 15 Low Power FM Radio Transmitters:
    BroadcastVision FM Transmitter
    C. Crane FM Transmitter 2
    Decade CM-10 FM Transmitter
    Decade MS-100 FM Transmitter
    Panaxis ACC100 FM Transmitter
    Radiosign RS-ACC100 FM Transmitter
    Whole House FM Transmitter 3
  Rangemaster, ChezRadio, Radio Systems, Grain Industries, Talking House
http://www.lpam.net/page-3/page-18/ 
  Links to the developers and sellers of FCC Type Certified Part 15 AM transmitters. 

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