Hi Marco,
Looking into the "Device0.txt" log you have posted, all message commands used for channel configuration are correct. Also, the responses to those message commands indicate that there are no errors. Therefore, configuring and opening the channel is correct.
After opening the channel, the log shows channel events; "EVENT_TX"([A4][03][40][00][01][03][E5]). These events indicate that messages are being transmitted at the specified channel period. Unless you specify the content of the messages, the messages' content is garbage.
You can specify the content of messages by using for example the message command 0x4E "ANT_SendBroadcastData" (more details is available in the ANT Message Protocol and Usage" document).
Moreover, I did not find "Channel:152 ucEvent: 0" values you have mentioned earlier in the posted device log. If these values are in the device log, please send that part to explore the reasons for such values. Otherwise, the channel responses correspond to the correct channel; that is channel 0.