The barbers I use in Luton has a trannie in the corner with Radio 1 on it (
), this picks up acft calling London on 121.275!
Many things can cause interference on aviation freqs. Duff thermostats are one, and then there was the famous case of a certain brand of baby alarm; one was found in a house 6nm final for Luton's rwy 26. CAA/Ofcom had to persuade Toys R Us to withdraw them from sale.