I'm looking for the best antenna for a motorola spectra a4 vhf 136-174 mhz can any one help me out
Some additional details will help provide better answers for you. For example, are you looking for a base or mobile antenna. While the Spectra is often a mobile radio, they also can be used as a base using a power supply and possibly with a mount such as the HLN6042A. It also may be important to know if it is the high or low power version of the Spectra. Antennas that can easily handle the 45 watt dash mount may burn up the loading coil on the 110 watt version.
It's also to know what you consider to be
best.
* I may need a very short antenna to fit into my garage while you may be OK with something much larger.
* I may live in a rural area with lots of flat land and need lots of gain. You may live in a large urban area with lots of intermod so a unity gain antenna would work better.
* I may be OK with drilling mounting holes in a brand new car while you just have to have a glass mount antenna.
* I may have an unlimited budget while you need something that costs next to nothing.
Please put as much thought into your question as you want us to put into the answer. While we're generally glad to help out, most of us are not able to read minds (only your posts).