diff --git a/src/energenie/OnAir.py b/src/energenie/OnAir.py
index 86ecaa7..8abd9ea 100644
--- a/src/energenie/OnAir.py
+++ b/src/energenie/OnAir.py
@@ -13,42 +13,50 @@
 # NOTE: This also might include intelligent power level selection based
 # on RSSI reports from different devices.
 
+import radio
+
 class OpenThingsAirInterface():
-    pass
+    def __init__(self):
+        pass #TODO
+        #   radio params defaults FSK, inner_repeats, outer_delay, outer_repeats, power_level, frequency
+        # tx defaults
+        # rx defaults
 
-    # init
-    #   radio params defaults FSK, inner_repeats, outer_delay, outer_repeats, power_level, frequency
+    def send(self, payload, radio_params=None):
+        pass #TODO
+        #   payload is a pydict suitable for OpenThings
+        #   radio_params is an overlay on top of radio tx defaults
+        #   tx, pydict payload and radio params in
+        #   OpenThings encode and encrypt, configure radio for FSK transmit, pass repeats
 
-    # send(payload, radio_params)
-    #   payload is a pydict suitable for OpenThings
-    #   radio_params is an overlay on top of radio tx defaults
-    #   tx, pydict payload and radio params in
-    #   OpenThings encode and encrypt, configure radio for FSK transmit, pass repeats
-
-    # receive(radio_params) #-> (radio_measurements) or (radio_measurements, payload)
-    #   radio_params is an overlay on top of radio rx defaults (e.g. poll rate, timeout, min payload, max payload)
-    #   radio_measurements might include rssi reading, short payload report, etc
-    #   rx, configure radio for FSK receive OpenThings decode and decrypt,
-    #   pydict payload and metadata (RSSI etc) out
+    def receive(self, radio_params): # -> (radio_measurements, payload or None)
+        pass # TODO
+        #   radio_params is an overlay on top of radio rx defaults (e.g. poll rate, timeout, min payload, max payload)
+        #   radio_measurements might include rssi reading, short payload report, etc
+        #   rx, configure radio for FSK receive OpenThings decode and decrypt,
+        #   pydict payload and metadata (RSSI etc) out
 
 
 class TwoBitAirInterface():
-    pass
+    def __init__(self):
+        pass # TODO
+        #   radio params defaults OOK, inner_repeats, outer_delay, outer_repeats, power_level, frequency
+        # tx defaults
+        # rx defaults
 
-    # init
-    #   radio params defaults OOK, inner_repeats, outer_delay, outer_repeats, power_level, frequency
+    def send(self, payload, radio_params=None):
+        pass #TODO
+        #   payload is just a list of bytes, or a byte buffer
+        #   radio_params is an overlay on top of radio tx defaults
+        #   tx, pydict payload and radio params in
+        #   TwoBit encode, configure radio for OOK transmit, pass repeats
 
-    # send(payload, radio_params)
-    #   payload is just a list of bytes, or a byte buffer
-    #   radio_params is an overlay on top of radio tx defaults
-    #   tx, pydict payload and radio params in
-    #   TwoBit encode, configure radio for OOK transmit, pass repeats
-
-    # receive(radio_params) #-> (radio_measurements) or (radio_measurements, payload)
-    #   radio_params is an overlay on top of radio rx defaults (e.g. poll rate, timeout, min payload, max payload)
-    #   radio_measurements might include rssi reading, short payload report, etc
-    #   rx, configure radio for OOK receive, TwoBit decode
-    #   pydict payload and metadata (RSSI etc) out
+    def receive(self, radio_params): # -> (radio_measurements, payload or None)
+        pass # TODO
+        #   radio_params is an overlay on top of radio rx defaults (e.g. poll rate, timeout, min payload, max payload)
+        #   radio_measurements might include rssi reading, short payload report, etc
+        #   rx, configure radio for OOK receive, TwoBit decode
+        #   pydict payload and metadata (RSSI etc) out
 
 
 # END