Bruce Carter

Every fourth value? Somebody is designing my filters and voltage dividers for me again. Give me a kit with every value!

This technique is called passive reflection, and has been used for decades by people in isolated valleys, etc. for difficult reception scenarios. As long as there is no amplification involved, you are perfectly legal.

This trick works for cell phones, too. Just put your phone where the wifi antenna would be —

http://www.medindia.net/news/Give-Your-Low-WiFi-Signal-a-Beer-Boost-90482-1.htm

I can only speak to the analog side of electronics. I have noted that the curricula emphasizes mathematical derivations and theory instead of the speedy production of real world products that perform under a variety of conditions. Engineers are instructed by PHD’s who are in love with the theory…

Let me shatter your confidence in simplicity! You think that applying an op amp is as simple as using a non-inverting circuit:

http://dsc.discovery.com/gear-gadgets/boost-your-wifi-signal-using-only-a-beer-can.html

You are probably looking for a difference amplifier. Search for that term on a semiconductor web site. It is basically an op amp compensated for much less than unity gain, and usually has the resistors integrated right on the chip. The 100 MHz requirement is a bit of an unusual requirement, but…

The old classic technique:

http://www.eetimes.com/design/power-management-design/4009609/Electronic-rheostat-provides-decades-of-load-resistance

Maxim has used a circuit similar to this for decades to test their power supplies – load current is independent of applied voltage. I’m in the process…

Your input capacitors are very large in relation to the frequencies you are detecting. In fact, they are probably inductive in your frequency range. So your loop antenna arrangement is probably not resonating where you expect. I suggest much smaller values, and making them NPO / COG dielectric….