Yes, in you're right, but we must remember this discussion has as the starting point some questions about number of coil number of turns, if using 7 turns it’s a correct choice, here given the small number of turns and low frequency signal used. In my opinion for this application, without using a ferrite core (and with or without the additional capacity of bipolar transistor circuit junctions), frequency is still very high, so it should be noted that this application need some adjustable ferrite core coil to obtain the required 27Mhz.