Factors Affecting Reception RNAV
If you have studied Comms, then you will be familiar with VHFVHF —Very High Frequency being a space wave that travels in a roughly straight line from transmitter to receiver. This aids knowing the factors that affect transmission - the height of transmitter and receiver (hence the "1.23 x" formula), intervening terrain, and ducting, where the signal refracts back towards the earth, reflects and then the process repeats. Buildings, being relatively small, tend not to affect VHFVHF —Very High Frequency transmission and this is possibly the "gotcha" answer.
This question comes in several different forms on both the RNav and Comms exams: ensure you know all the factors affecting the reception.
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