[HomeBrew] notch filter

[Richard Blackman]

Hello to group.
I am trying to build a 72 MHz notch filter.

I  have used the ELSIE software from  Tonne Software, the free demo student 
edition.
It is a butterworth T shaped filter.
pole 1 is 2.5 nH in parallel with a 1900 pF cap
pole 2 is 2.4 uH in series with a 2 pF cap
pole 3 is 2.5 nH in parallel with a 1900 pF cap.

The plotted  shape , and tabulated values for transmittion give over -30 dB 
at 72 Mhz.
The problem is that it does not appear to be working, all it does is 
slightly attenuate all frequencies applied to it. I built the filter on 
single sided copper board, and cut out pads with a dremel tool for ugly type 
construction on the copper side. The components are very tightly grouped. I 
wonder if each pole should be farther apart and isolated with metal 
dividers. Do you feel that the closeness of the components, especially the 
inductors, is causing bleed through and loss of attenuation? Or am I way off 
base in my troubleshooting? The second pole uses a trimmer cap and a trimmer 
inductor. varying either has absolutely no effect in notching out a 72 Mhz 
signal from my homebrew 72 Mhz local oscillator.

Any ideas on how to improve, or should I take a completely different 
approach?