The sensitivity of receiver it is possible to increase itself considerably, if is interfered, between this and his aerial, a amplifier RF. The amplifier of circuit, does not use in resonant circuits and for this is suitable, so much for mid waves, what for the low waves, up to the 40 MHZ. The gain his it is the order 20db and it consumes 7mA, when it is supplied with 12 until 15V dc. His entry and the exit are adapted with coaxial cable, complex resistance 75ohm. Part List R1=75 ohm R8=470 ohm C5-6=47nF 100V R2=10K ohm R9=2.2 Kohm Q1-2-3= AF125 R3-7=5.6 Kohm R10=68 ohm J1-2=Jack BNC R4-5 =4.7 Kohm C1-3=47nF 100V R6=820 ohm C2-4=10nF 100V Source http://users.otenet.gr/~athsam/RF_amp_wide_band.htm