I'm not sure I quite understand what you're trying to do.
If you want to find which RF Profile a device has you can get it with this API:
https://api.meraki.com/api_docs/v0#return-the-radio-settings-of-a-device
If the setting is null then it is using the default for the model of AP that you have. Basic Indoor Profile is going to be the default for all indoor APs (MR33 etc.). The Basic Outdoor Profile will be used by outdoor APs (MR84 etc.).
https://api.meraki.com/api_docs/v0#update-the-radio-settings-of-a-device
The ID of an RF profile to assign to the device. If the value of this parameter is null, the appropriate basic RF profile (indoor or outdoor) will be assigned to the device. Assigning an RF profile will clear ALL manually configured overrides on the device (channel width, channel, power).
If you're trying to get the channel number, channel width, and power you can get the SSID status of the AP.
https://api.meraki.com/api_docs/v0#return-the-ssid-statuses-of-an-access-point