Portable 100 watts
Operating portable can be a lot of fun. You don't need a massive tower and yagi array to work the world. A simple wire antenna and a small rig is all you really need. My favorite high power rig for portable operating is the Yaesu FT-897D. For a rig in the 100 watt category, it draws fairly low current compared to other rigs like the Yaesu FT-450 and the Icom IC 7000. With less current drain on you battery, you will be able operate a lot longer before the battery goes to a low voltage state where the rig will no longer operate correctly.
I published a product review of the Yaesu FT 897D in the local club's newsletter. Here is the article: FT 897D product review PDF. There is a rig current drain comparison chart in this review.
I found operating at one of the local parks, on top of a mountian, to be a lot of fun. I've used numerous antennas ranging from a simple table top home brew antenna as well as numerous antennas made by Hy Power Antenna Company.
Complete compact portable 100 watt station:
Shown to the left is my FT 897D w/500 hz CW filter. I mostly operate CW but at times, if the band is in good shape, I will operate SSB. When operating portable I will either run 5 or 50 watts. The battery can handle short operating times of 100 watts but that limits the amount of time I can stay on the air. Remember, 50 watts out is only 3 DB down in power from 100 watts. That comes out to only ½ of an S unit less in signal strength. I judge my power level on band conditions.
The day this picture was taken I was using an Off Center Fed antenna (OCF40Q) made by, "Hy Power Antenna Company" . This antenna will cover 6, 10, 20 and 40 meters. It is their low power version that is rated at 250 watts. The Kenwood TH F6A is to the left of the rig and I listen to the local repeater while I’m at the park. I can’t hit the repeater from that location with the HT but the repeater has a 6 meter input. If I want to talk to anybody on the repeater I just put the 897 on 6 meters and with 50 watts to the "OCF40Q." I can easily talk to the repeater. In the second picture shown to the left are SWR readings of the OCF40. Take note how low the SWR is per band. An ATU is not needed when using this antenna.
Hy Power Antenna Company also makes Micro Series dipoles and OCF's. These guys will fit in you pants pocket. A full size OCF40QM is an off center fed 40 meter antenna that works on 2, 6, 10, 20 and 40 meters. It will handle up to 250 watts and fits in your pocket.
In this You Tube video I make reference to the vertical mounted on the back of the IC 703. What I am talking about is shown in the picture on top of my QRP Portable web page.