Update November 26, 2015:
I made a full project with preamp/signal conditioning and power supply with soft on/of switch. It is published here.
This is the same as the previous frequency counter but the output is on the 16x2 LCD display.
For more details about how it work look here: http://diyfan.blogspot.bg/2015/08/100mhz-frequency-counter.html
Bellow are pictures and short video, showing the frequency counter in action. As my oscilloscope is with only 70Mhz bandwidth, the 110+ MHz signal looks like sinusoidal, but it is probably not.
I generate the test signal with SN74HC00N connected in this way:
Source code and HEX file can be downloaded here: http://bit.ly/FreqC-LCD