diff --git a/adafruit_ble/advertising/adafruit.py b/adafruit_ble/advertising/adafruit.py
index 44f65c0..45b1083 100755
--- a/adafruit_ble/advertising/adafruit.py
+++ b/adafruit_ble/advertising/adafruit.py
@@ -43,6 +43,8 @@
 _MANUFACTURING_DATA_ADT = const(0xff)
 _ADAFRUIT_COMPANY_ID = const(0x0822)
 _COLOR_DATA_ID = const(0x0000)
+_RADIO_DATA_ID = const(0x0001)  # TODO: check this isn't already taken.
+
 
 class AdafruitColor(Advertisement):
     """Broadcast a single RGB color."""
@@ -61,12 +63,17 @@ class AdafruitColor(Advertisement):
     color = ManufacturerDataField(_COLOR_DATA_ID, "<I")
     """Color to broadcast as RGB integer."""
 
-# TODO: Add radio packets.
-#
-# class AdafruitRadio(Advertisement):
-#     prefix = b"\x06\xff\xff\xff\x00\x01"
-#
-#     channel = Struct()
-#     address =
-#     group =
-#     data =
+
+class AdafruitRadio(Advertisement):
+    """Broadcast arbitrary bytes as a radio message."""
+    prefix = struct.pack("<BBHH",
+                         0x6,
+                         _MANUFACTURING_DATA_ADT,
+                         _ADAFRUIT_COMPANY_ID,
+                         _RADIO_DATA_ID)
+    manufacturer_data = LazyField(ManufacturerData,
+                                  "manufacturer_data",
+                                  advertising_data_type=_MANUFACTURING_DATA_ADT,
+                                  company_id=_ADAFRUIT_COMPANY_ID,
+                                  key_encoding="<H")
+    msg = ManufacturerDataField(_RADIO_DATA_ID, "<248s")  # 255 byte ads