TV antenna booster


The circuit shown here is of a TV antenna booster based on the transistor BF180. The circuit operates in the UHF band and has a gain of 15dB. Capacitors C2,C3 C4 ,C5 and inductors L3, L4 forms a UHF band pass filter. The input signal is fed to the emitter of Q1 through this filter. Resistor R2 and R3 biases the transistor Q1 which is wired in the common base configuration.

Circuit diagram.


  • Assemble the circuit on a good quality PCB.
  • For better performance, enclose the circuit in a metal box.
  • The circuit can be powered from 12V DC.
Show Comments

25 thoughts on “TV antenna booster

  1. mnasim31

    Seetharaman jee, can I use this circuit as add-on to my UHF tv transmitter circuit in between the circuit and the antenna? Thanks

    • Seetharaman

      Check for corrosion in the connecting leads, Dipole edge connections at the clamp end. directors and reflector also should be clean at the clamp end. The dipole should not touch each other at the wire connecting end. You check the continuity of the antenna wire at the receiver end it should be 15 to 50 ohms depends on the length of the cable used from antenna. Do not coil the excess length of the cable anywhere. cut the excess length use only the required length of cable. Check also the direction of the antenna

  2. priatna

    saya membutuhkan antena yng cocok untuk di daerah pegunungan yng sinyalnya sangat lemah sekali. tolong ksik petujuk/ jawabannya. thankyou

  3. Seetharaman

    In winding inductors for RF designs, this measuring circuit allows the designer to know exactly when the desired inductance has been achieved. As an example, the number of turns for a single layer air core inductor is given by

    N =[ √l X (9a + 10b) ]/ a²


    l = inductance in microhenries,

    a = coil radius in inches,

    b = coil length in inches,

    N = number of turns.

  4. Seetharaman

    Hi Howard use a low pass filter for DC and Hi Pass filter for the RF. (just a capacitor to block DC and a choke to block RF.

  5. howard

    I’d like to build manhatten-style (point-point, directly on a copper-clad board), mount it on the back of a UHF bow-tie antenna, and powered from a wall-wart at ground level. How can I separate the DC power from the RF if I use only the RG-6 feeder cable for the interface?

  6. Pingback: Blog » Blog Archive » TV antenna booster

  7. seetharaman

    Hi Manir you can use 2N918 BF594 BF597 BF595 BF197 BF195 BF194 BF195 BF 173 BF176 any high frequency transistor can be tried

  8. Manir


    BF180 is not available in the stores around Toronto, 2SC2570 is not either.

    What are the substitutes of BF180?



  9. seetharaman

    Hi Roger i have not yet tried with BF180 but i tried with 2SC2570 really good performance in UHF band noisey signal will improve and the grainy picture will get improved, audio mush also will come down.( you cannot use where signal strength is quite high


Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>