Terminal NDBs are usually low powered so that they do not interfere with other NDBs at the same frequency. Analogous considerations are given to frequency allocations for VORs. High Altitude VORs with the same frequency will be farther apart than terminal VORs.
So, while you might receive a terminal NDB from a long distance, you will want to monitor the identification as it may change until you are within the published range.
For more amusement you can monitor marine NDBs which share a common frequency, but transmit at seperate intervals.